Solve the problem.
-A die is rolled 9 times and the number of times that two shows on the upper face is counted. If this experiment is repeated many times, find the mean for the number of twos.
A) 7.5
B) 3
C) 2.25
D) 1.5

Question

Quizplus · Accepted Answer

The mean number of twos is calculated using the formula for the expected value of a binomial distribution: n * p, where n is the number of trials (9 rolls) and p is the probability of rolling a two (1/6). Thus, the mean is 9 * (1/6) = 1.5.

Solve the Problem. -A Die Is Rolled 9 Times and the Number of the Number