The number of rainy days per month at Seattle follows a Poisson distribution with a mean value of ...

The number of rainy days per month at Seattle follows a Poisson distribution with a mean value of 4.5 days. What is the probability that it will rain 3 days next month?

A) 0.3604
B) 0.2222
C) 0.1687
D) 0.2521

Q. 2

Let the random variable Z follow a standard normal distribution. Find P(0 < Z < 0.57).

A) 0.2843
B) 0.7843
C) 0.2157
D) 0.7157

Q. 3

A gumball machine has six red gumballs, four blue gumballs, and three yellow gumballs. If you buy three gumballs, what is the probability that you get three different colors?

A) 0.252
B) 0.167
C) 0.125
D) 0.244

Q. 4

To find percentiles and quantities, data must be first arranged in:

A) descending order.
B) ascending order.
C) alphabetical order.
D) scattered order.

Q. 5

Thirty percent of all households have a DVD player. If you select 20 houses at random, what is the probability that six or fewer of them have a DVD player?

A) 0.608
B) 0.416
C) 0.344
D) 0.238

Q. 6

An example of a quantitative variable is the make of a car.

Indicate whether the statement is true or false

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The number of rainy days per month at Seattle follows a Poisson distribution with a mean value of ...

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