A die is rolled 19 times and the number of twos that come up is tallied. If this experiment is repeated many times, find the standard deviation for the number of twos.
A) 2.2
B) 15.8
C) 4.8
D) 1.6

Question

Quizplus · Accepted Answer

The standard deviation for a binomial distribution is calculated using the formula √(n * p * (1-p)), where n is the number of trials (19), and p is the probability of success (rolling a two, which is 1/6). Plugging in these values gives √(19 * 1/6 * 5/6) ≈ 1.6.

A Die Is Rolled 19 Times and the Number of Twos