OPRE quiz 2

Florida lottery system uses the random selection of 6 integers from a group of 53 to determine the weekly winner. Determine the number of ways integers can be selected from a group of 53.

• 6

• 16,529,385,600

• 22,957,480

• 38,160

An MBA new-matriculants survey provided the following data for 2018 students whether they Applied to More Than One School:

Given that a person applied for more than one school, what is the probability the person is 24-26 years old? Round to 4 decimal places.

Answer explanation

.3700

Refer again to the data from MBA new matriculants survey:

Applied to More Than One School:

Given that a person person is in 36-and-over age group, what is the probability the person applied to more than one school? Round to 4 decimal places.

Answer explanation

.2318

If A and B are independent events with P(A) = .05 and P(B) = .65, then P(A | B) = _____.

• .8

• .0325

• .65

• .05

If A and B are independent events with P(A) = .2 and P(B) = .6, then P(A ∪ B) = _____.

• .60

• .68

• .12

• .62

If A and B are mutually exclusive events with P(A) = .3 and P(B) = 0.5, then P(A ∩ B) =

• .20

• 0

• .15

• .30

A description of how the probabilities are distributed over the values the random variable can assume is called a(n) _____.

• probability distribution

• probability function

• random variable

• expected value

A numerical description of the outcome of an experiment is called a _____.

• variance

• descriptive statistic

• probability function

• random variable

A property of the Poisson distribution is that the mean equals the _____.

• mode

• median

• variance

• standard deviation

Exhibit 5-11

The random variable x is the number of occurrences of an event over an interval of 10 minutes. It can be assumed the probability of an occurrence is the same in any two time periods of an equal length. It is known that the mean number of occurrences in 10 minutes is 5.3.

Refer to Exhibit 5-11. The probability there are 8 occurrences in 10 minutes is _____.

• .0241

• .1126

• .0771

• .9107