It a recent study of college students indicated that 30% of all college students had at least one tattoo. A small private college decided to randomly and independently sample 15 of their students and ask if they have a tattoo. Find the standard deviation for this binomial random variable. Round to the nearest hundredth when necessary.
A) 4.5
B) 10.5
C) 3.15
D) 1.77 4.5 The Poisson Random Variable (Optional)
1 Find Probability

Question

Quizplus · Accepted Answer

The standard deviation for a binomial random variable is calculated using the formula: √(n * p * (1-p)), where n is the number of trials and p is the probability of success. Here, n = 15 and p = 0.3. So, the standard deviation is √(15 * 0.3 * 0.7) = √3.15 ≈ 1.77.

It a Recent Study of College Students Indicated That 30