If n = 10 and π = 0.70, then the standard deviation of the binomial distribution is
A) 0.07.
B) 1.45.
C) 7.00.
D) 14.29.

Question

Quizplus · Accepted Answer

The formula for the standard deviation of a binomial distribution is given by σ = √(np(1-p)), where n is the number of trials and p is the probability of success. 
Substituting n = 10 and π = 0.70, we get
σ = √(10 × 0.70 × 0.30) 
σ = √2.1 
σ ≈ 1.45

Therefore, the best choice is B.

If N = 10 and π = 0