Exam 6: Discrete Probability Distributions

For the following distribution: What is the mean of the distribution?

Which is true for a binomial distribution?

What must you know to develop a binomial probability distribution?

When sampling is done without replacement from a finite population and the outcomes are measured as either a success or failure,the hypergeometric distribution should be applied.

The binomial probability distribution is always negatively skewed.

A probability distribution is a mutually exclusive and collectively exhaustive listing of experimental outcomes that can occur by chance,and their corresponding probabilities.

Carlson Jewelers permits the return of their diamond wedding rings,provided the return occurs within two weeks of the purchase date. Their records reveal that 10% of the diamond wedding rings are returned. Five different customers buy a wedding ring. What is the probability that none of the customers return a ring?

A type of probability distribution that shows the probability of x successes in n trials,where the probability of success remains the same from trial to trial,is referred to as a ________.

A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0,1,2,3,4,or 5 days last month. What is the standard deviation of the number of days absent?

A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0,1,2,3,4,or 5 days last month. What is the variance of the number of days absent?

For the following distribution: What is the variance of the distribution?

A random variable represents the outcome of an experiment.

The variance of a probability distribution is based on the sum of squared differences from the mean multiplied by the probability of X.

To construct a binomial distribution,it is necessary to know the total number of trials and the probability of success on each trial.

The mean of a binomial distribution is the product of n and π.

As a general rule of thumb,if the items selected for a sample are not replaced and the sample size is less than 5% of the population,the binomial distribution can be used to approximate the hypergeometric distribution.

A farmer who grows genetically engineered corn is experiencing trouble with corn borers. A random check of 5,000 ears revealed the following: Many of the ears contained no borers. Some ears had one borer. A few had two borers,and so on. The distribution of the number of borers per ear approximated the Poisson distribution. The farmer counted 3,500 borers in the 5,000 ears. What is the probability that an ear of corn selected at random will contain no borers?

A true/false test consists of six questions. If you guess the answer to each question,what is the probability of getting all six questions correct?

An experiment consists of making 80 telephone calls in order to sell a particular insurance policy. The random variable in this experiment is a ________.

Which of the following is correct about a probability distribution?