-An auto salesperson sells on average 4.2 cars per month. Find the probability that during a given month, the salesperson will sell less than three cars.

-If selecting samples of size n < 30 from a population with a known mean and standard deviation, what requirement, if any, must be satisfied in order to assume that the distribution of the sample means is a normal distribution?

1.The population must have a mean of 0.

2.The population must have a standard deviation of 1.

3.The population must have a normal distribution.

4.None, the distribution of a sample means will be approximately normal.

-Of the 45 people who answered 'yes' to a question, 13 were male. Of the 83 people that answered 'no' to the question, 7 were male. If one person is selected at random from the group, what is the probability that the person answered 'yes' or was male?

1. 0.289
2. 0.156
3. 0.414
4. 0.406

-The number of accidents to occur at a busy intersection during 24-hour period has a Poisson distribution. If the probability of no accidents during a 24-hour period is 0.3679, what is the mean number of accidents per 24-hour period?

-The number of calls received by a car towing service averages 14.4 per day (per 24-hour period). Assuming Poisson distribution, find the probability that in a randomly selected hour the number of calls is 3.

1. 0.02173
2. 0.01976
3. 0.00028
4. 0.01185