The number of male babies in a sample of 10 randomly chosen babies is a:
A)continuous random variable.
B)Poisson random variable.
C)binary random variable.
D)binomial random variable.

Question

Quizplus · Accepted Answer

A binomial random variable is used when we have a fixed number of independent trials, and each trial outcomes in one of two possible outcomes (success or failure). In this case, the fixed number of trials is 10 (we are randomly choosing 10 babies), and each trial can result in either a male baby (success) or a female baby (failure). Therefore, the number of male babies in the sample is a binomial random variable.

The Number of Male Babies in a Sample of 10