Tabulation of a strike vote showed that 90% of those voting cast their ballot in favour of strike action. You take a sample of 50 voters. Assume this to be a binomial distribution. What is the standard deviation for this distribution?
A) 45
B) 4.5
C) 2.12
D) 20.25
E) None of the choices are correct.

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 = 50 and p = 0.9, so the standard deviation is √(50 * 0.9 * 0.1) = 2.12.

Tabulation of a Strike Vote Showed That 90% of Those