Exam 6: Continuous Random Variables

An apple juice producer buys all his apples from a conglomerate of apple growers in one northwestern state.The amount of juice squeezed from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce.77 percent of the apples will contain at least how many ounces of juice?

(Multiple Choice)

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Question 61

For a continuous distribution,P(X ≤ 100)= P(X < 100).

(True/False)

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Question 62

The probability that an appliance is currently being repaired is .5.If an apartment complex has 100 such appliances,what is the probability that at least 60 are currently being repaired? Use the normal approximation to the binomial.

(Multiple Choice)

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Question 63

Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard deviation of 8 minutes.What is the probability that a randomly selected individual will have a waiting time between 15 and 45 minutes?

(Multiple Choice)

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Question 64

The standard deviation of a standard normal distribution is always equal to 1.

(True/False)

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Question 65

The ___________ is a graphic that is used to check visually whether data come from a normal population.

(Multiple Choice)

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Question 66

If the wages of workers for a given company are normally distributed with a mean of $15 per hour,then the proportion of the workers earning more than $13 per hour:

(Multiple Choice)

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Question 67

The lifetime of a stereo component is exponentially distributed with mean 1,000 days.What is the probability that the lifetime exceeds 1,000 days?

(Multiple Choice)

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Question 68

For a continuous distribution,the exact probability of a particular value is zero.

(True/False)

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Question 69

The average time a subscriber spends reading the local newspaper is 49 minutes.Assume the standard deviation is 16 minutes and that the times are normally distributed.What is the probability a subscriber will spend no more than 30 minutes reading the paper?

(Multiple Choice)

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Question 70

A study shows that employees that begin their workday at 9:00 a.m.vary their times of arrival uniformly from 8:40 a.m.to 9:30 a.m.The probability that a randomly chosen employee reports to work between 9:00 and 9:10 is:

(Multiple Choice)

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Question 71

While conducting experiments,a marine biologist selects water depths from a uniformly distributed collection that vary between 2.00 m and 7.00 m.What is the probability that a randomly selected depth is within 1 standard deviation of the mean?

(Multiple Choice)

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Question 72

Suppose the daily change in price of a stock is normally distributed with mean = .20 and standard deviation = .30.What price change is associated with the 25^th percentile?

(Multiple Choice)

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Question 73

An apple juice producer buys all his apples from a conglomerate of apple growers in one northwestern state.The amount of juice squeezed from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce.What is the probability that a randomly selected apple will contain between 2.00 and 2.50 ounces?

(Multiple Choice)

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Question 74

The average time a subscriber spends reading the local newspaper is 49 minutes.Assume the standard deviation is 16 minutes and that the times are normally distributed.For the 10 percent who spend the most time reading the paper,how much time do they spend?

(Multiple Choice)

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Question 75

A set of final examination grades in a calculus course was found to be normally distributed with a mean of 69 and a standard deviation of 9.What proportion of students scored between 81 and 89?

(Multiple Choice)

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Question 76

During the past six months,73.2 percent of US households purchased sugar.Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10.Find the probability that a household spent more than $10.00 on sugar.

(Multiple Choice)

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Question 77

The mean of a standard normal distribution is always equal to ____________.

(Multiple Choice)

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Question 78

Values of the standard normal random variable are measured:

(Multiple Choice)

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Question 79

Given that X is a normal random variable,the probability that a given value of X is below its mean is ________________.

(Multiple Choice)

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Question 80

Showing 61 - 80 of 150

For a continuous distribution,P(X ≤ 100)= P(X < 100).

The probability that an appliance is currently being repaired is .5.If an apartment complex has 100 such appliances,what is the probability that at least 60 are currently being repaired? Use the normal approximation to the binomial.

The standard deviation of a standard normal distribution is always equal to 1.

The ___________ is a graphic that is used to check visually whether data come from a normal population.

If the wages of workers for a given company are normally distributed with a mean of $15 per hour,then the proportion of the workers earning more than $13 per hour:

The lifetime of a stereo component is exponentially distributed with mean 1,000 days.What is the probability that the lifetime exceeds 1,000 days?

For a continuous distribution,the exact probability of a particular value is zero.

The average time a subscriber spends reading the local newspaper is 49 minutes.Assume the standard deviation is 16 minutes and that the times are normally distributed.What is the probability a subscriber will spend no more than 30 minutes reading the paper?

A study shows that employees that begin their workday at 9:00 a.m.vary their times of arrival uniformly from 8:40 a.m.to 9:30 a.m.The probability that a randomly chosen employee reports to work between 9:00 and 9:10 is:

While conducting experiments,a marine biologist selects water depths from a uniformly distributed collection that vary between 2.00 m and 7.00 m.What is the probability that a randomly selected depth is within 1 standard deviation of the mean?

Suppose the daily change in price of a stock is normally distributed with mean = .20 and standard deviation = .30.What price change is associated with the 25^th percentile?

The average time a subscriber spends reading the local newspaper is 49 minutes.Assume the standard deviation is 16 minutes and that the times are normally distributed.For the 10 percent who spend the most time reading the paper,how much time do they spend?

A set of final examination grades in a calculus course was found to be normally distributed with a mean of 69 and a standard deviation of 9.What proportion of students scored between 81 and 89?

During the past six months,73.2 percent of US households purchased sugar.Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10.Find the probability that a household spent more than $10.00 on sugar.

The mean of a standard normal distribution is always equal to ____________.

Values of the standard normal random variable are measured:

Given that X is a normal random variable,the probability that a given value of X is below its mean is ________________.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Comparing Two Means and Two Proportions

Filters

Exam 6: Continuous Random Variables

For a continuous distribution,P(X ≤ 100)= P(X < 100).

The probability that an appliance is currently being repaired is .5.If an apartment complex has 100 such appliances,what is the probability that at least 60 are currently being repaired? Use the normal approximation to the binomial.

The standard deviation of a standard normal distribution is always equal to 1.

The ___________ is a graphic that is used to check visually whether data come from a normal population.

If the wages of workers for a given company are normally distributed with a mean of $15 per hour,then the proportion of the workers earning more than $13 per hour:

The lifetime of a stereo component is exponentially distributed with mean 1,000 days.What is the probability that the lifetime exceeds 1,000 days?

For a continuous distribution,the exact probability of a particular value is zero.

The average time a subscriber spends reading the local newspaper is 49 minutes.Assume the standard deviation is 16 minutes and that the times are normally distributed.What is the probability a subscriber will spend no more than 30 minutes reading the paper?

A study shows that employees that begin their workday at 9:00 a.m.vary their times of arrival uniformly from 8:40 a.m.to 9:30 a.m.The probability that a randomly chosen employee reports to work between 9:00 and 9:10 is:

While conducting experiments,a marine biologist selects water depths from a uniformly distributed collection that vary between 2.00 m and 7.00 m.What is the probability that a randomly selected depth is within 1 standard deviation of the mean?

Suppose the daily change in price of a stock is normally distributed with mean = .20 and standard deviation = .30.What price change is associated with the 25th percentile?

The average time a subscriber spends reading the local newspaper is 49 minutes.Assume the standard deviation is 16 minutes and that the times are normally distributed.For the 10 percent who spend the most time reading the paper,how much time do they spend?

A set of final examination grades in a calculus course was found to be normally distributed with a mean of 69 and a standard deviation of 9.What proportion of students scored between 81 and 89?

During the past six months,73.2 percent of US households purchased sugar.Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10.Find the probability that a household spent more than $10.00 on sugar.

The mean of a standard normal distribution is always equal to ____________.

Values of the standard normal random variable are measured:

Given that X is a normal random variable,the probability that a given value of X is below its mean is ________________.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Comparing Two Means and Two Proportions

Filters

Suppose the daily change in price of a stock is normally distributed with mean = .20 and standard deviation = .30.What price change is associated with the 25^th percentile?