A laboratory worker finds that 1.6% of his blood samples test positive for the HIV virus.In a random sample of 130 blood tests,what is the standard deviation of the number that test positive for the HIV virus?
A)2.04672
B)11.31
C)2.08
D)1.44
E)1.43

Question

Quizplus · Accepted Answer

The standard deviation for a binomial distribution is calculated using the formula √(n * p * (1-p)), where n is the sample size and p is the probability of success. Here, n = 130 and p = 0.016.

A Laboratory Worker Finds That 1