Question 1

In binomial experiments, the outcomes are usually classified as successes or failures.

Accepted Answer

A) True 
 B)False  True

Question 2

A package of 10 batteries is checked to determine if there are any dead batteries.Four batteries are checked.If one or more are dead, the package is not sold.What is the probability that the package will
Not be sold if there are actually three dead batteries in the package?

Accepted Answer

A)  2/3
B)  6/7
C)  5/6
D)  4/5 C

Question 3

In a survey, 80% of the voters support a particular referendum.If 40 voters are chosen at random, and X
is the number of voters that support this referendum, find the mean and variance of X.

Accepted Answer

The mean is 32 and the variance is 6.4.

Question 4

What is the standard deviation of the following probability distribution?

Accepted Answer

A)  2.6
B)  4.7
C)  5.4
D)  3.9

Question 5

If the standard deviation of a probability distribution is 6.25, the variance is 2.30.

Accepted Answer

A) True 
 B)False

Question 6

A computer store has 50 printers of which 40 are laser printers and 10 are ink jet printers.If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet
Printers.

Accepted Answer

A)  Mean = 2, Variance = 0.2
B)  Mean = 2, Variance = 3
C)  Mean = 1, Variance = 0.2
D)  Mean = 2, Variance = 1.6

Question 7

Which of the following could be used as a measure of spread of a probability distribution.

Accepted Answer

A)   
B)   
C)   
D)  All of these formula measure spread

Question 8

A pet supplier has a stock of parakeets of which 10% are blue parakeets.A pet store orders 3 parakeets from this supplier.If the supplier selects the parakeets at random, what is the chance that the pet store
Gets exactly one blue parakeet?

Accepted Answer

A)  0.081
B)  0.243
C)  0.027
D)  0.003

Question 9

In a survey, 65% of the voters support a particular referendum.If 40 voters are chosen at random, and X
is the number of voters that support this referendum, find the standard deviation of X.

Accepted Answer

The answer of In a survey, 65% of the voters...

Question 10

A(n) __________ probability distribution consists of the values a random variable can assume and the
corresponding probabilities of the values.
________________________________________

Accepted Answer

The answer of A(n) __________ probability distribution consists of the...

Question 11

Find the mean of the distribution shown.

Accepted Answer

A)  0.79
B)  1.25
C)  1.01
D)  1.52

Question 12

The number of song requests a radio station receives per day is indicated in the table below.Construct a
graph for this data.

Accepted Answer

The answer of The number of song requests a radio...

Question 13

The probability that federal income tax returns will have 0, 1, or 2 errors is 0.53, 0.15, and 0.32, respectively.If 10 randomly selected returns are audited, what is the probability that six will have no
Errors, three will have one error, and one will have two errors?

Accepted Answer

A)  0.184
B)  0.127
C)  0.020
D)  0.035

Question 14

The Poisson distribution is used when n is small and p is large.

Accepted Answer

A) True 
 B)False

Question 15

The probability of observing 50 heads in 100 tosses of a fair coin is less likely than observing 500 heads
in 1000 tosses.

Accepted Answer

A) True 
 B)False

Question 16

A bag contains 25 white marbles and 32 black marbles.The probability P(X) of selecting without replacement a sample of size 9 of 3 white marbles and 6 black marbles is

Accepted Answer

A)   
B)   
C)   
D)

Question 17

If there are 20 typographical errors randomly distributed in a 250-page document, the probability that a
given page contains exactly two errors is 0.3%.

Accepted Answer

A) True 
 B)False

Question 18

A(n) __________ is one in which values are determined by chance.
________________________________________

Accepted Answer

The answer of A(n) __________ is one in which values...

Question 19

What of the following pairs of probability values would complete the following probability distribution?

Accepted Answer

A)   
B)   
C)   
D)

Question 20

A jewellery supplier has a supply of pairs of earrings of which 10% are platinum pairs.A jewellery store orders five sets of earrings from this supplier.If the supplier selects the pairs of earrings at random, what
Is the chance that the jewellery store gets exactly two sets of platinum pairs?

Accepted Answer

A)  0.3645
B)  0.0405
C)  0.0729
D)  0.0030

Exam 5: Discrete Probability Distributions

In binomial experiments, the outcomes are usually classified as successes or failures.

A package of 10 batteries is checked to determine if there are any dead batteries.Four batteries are checked.If one or more are dead, the package is not sold.What is the probability that the package will Not be sold if there are actually three dead batteries in the package?

In a survey, 80% of the voters support a particular referendum.If 40 voters are chosen at random, and X is the number of voters that support this referendum, find the mean and variance of X.

What is the standard deviation of the following probability distribution?

If the standard deviation of a probability distribution is 6.25, the variance is 2.30.

A computer store has 50 printers of which 40 are laser printers and 10 are ink jet printers.If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet Printers.

Which of the following could be used as a measure of spread of a probability distribution.

A pet supplier has a stock of parakeets of which 10% are blue parakeets.A pet store orders 3 parakeets from this supplier.If the supplier selects the parakeets at random, what is the chance that the pet store Gets exactly one blue parakeet?

In a survey, 65% of the voters support a particular referendum.If 40 voters are chosen at random, and X is the number of voters that support this referendum, find the standard deviation of X.

A(n) probability distribution consists of the values a random variable can assume and the corresponding probabilities of the values. ______________________________

Find the mean of the distribution shown.

The number of song requests a radio station receives per day is indicated in the table below.Construct a graph for this data.

The probability that federal income tax returns will have 0, 1, or 2 errors is 0.53, 0.15, and 0.32, respectively.If 10 randomly selected returns are audited, what is the probability that six will have no Errors, three will have one error, and one will have two errors?

The Poisson distribution is used when n is small and p is large.

The probability of observing 50 heads in 100 tosses of a fair coin is less likely than observing 500 heads in 1000 tosses.

A bag contains 25 white marbles and 32 black marbles.The probability P(X) of selecting without replacement a sample of size 9 of 3 white marbles and 6 black marbles is

If there are 20 typographical errors randomly distributed in a 250-page document, the probability that a given page contains exactly two errors is 0.3%.

A(n) is one in which values are determined by chance. ______________________________

What of the following pairs of probability values would complete the following probability distribution?

A jewellery supplier has a supply of pairs of earrings of which 10% are platinum pairs.A jewellery store orders five sets of earrings from this supplier.If the supplier selects the pairs of earrings at random, what Is the chance that the jewellery store gets exactly two sets of platinum pairs?

Exam 5: Discrete Probability Distributions

In binomial experiments, the outcomes are usually classified as successes or failures.

A package of 10 batteries is checked to determine if there are any dead batteries.Four batteries are checked.If one or more are dead, the package is not sold.What is the probability that the package will Not be sold if there are actually three dead batteries in the package?

In a survey, 80% of the voters support a particular referendum.If 40 voters are chosen at random, and X is the number of voters that support this referendum, find the mean and variance of X.

What is the standard deviation of the following probability distribution?

If the standard deviation of a probability distribution is 6.25, the variance is 2.30.

A computer store has 50 printers of which 40 are laser printers and 10 are ink jet printers.If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet Printers.

Which of the following could be used as a measure of spread of a probability distribution.

A pet supplier has a stock of parakeets of which 10% are blue parakeets.A pet store orders 3 parakeets from this supplier.If the supplier selects the parakeets at random, what is the chance that the pet store Gets exactly one blue parakeet?

In a survey, 65% of the voters support a particular referendum.If 40 voters are chosen at random, and X is the number of voters that support this referendum, find the standard deviation of X.

A(n) __________ probability distribution consists of the values a random variable can assume and the corresponding probabilities of the values. ________________________________________

Find the mean of the distribution shown.

The number of song requests a radio station receives per day is indicated in the table below.Construct a graph for this data.

The probability that federal income tax returns will have 0, 1, or 2 errors is 0.53, 0.15, and 0.32, respectively.If 10 randomly selected returns are audited, what is the probability that six will have no Errors, three will have one error, and one will have two errors?

The Poisson distribution is used when n is small and p is large.

The probability of observing 50 heads in 100 tosses of a fair coin is less likely than observing 500 heads in 1000 tosses.

A bag contains 25 white marbles and 32 black marbles.The probability P(X) of selecting without replacement a sample of size 9 of 3 white marbles and 6 black marbles is

If there are 20 typographical errors randomly distributed in a 250-page document, the probability that a given page contains exactly two errors is 0.3%.

A(n) __________ is one in which values are determined by chance. ________________________________________

What of the following pairs of probability values would complete the following probability distribution?

A jewellery supplier has a supply of pairs of earrings of which 10% are platinum pairs.A jewellery store orders five sets of earrings from this supplier.If the supplier selects the pairs of earrings at random, what Is the chance that the jewellery store gets exactly two sets of platinum pairs?

A(n) probability distribution consists of the values a random variable can assume and the corresponding probabilities of the values. ______________________________

A(n) is one in which values are determined by chance. ______________________________