Question

What are the mean and standard deviation of a binomial probability distribution with `n=25` and `p=11/17`?

Answer 1

The mean of X is u = np
The standard deviation of X is `sum = sqrt[np(1-p)]`

Explanation:

If X has a binomial distribution with n trials and probability of success p on each trial, then:

1. The mean of X is u = np
2. The variance of X is `(sum)^2 = np(1-p)`
3. The standard deviation of X is `sum = sqrt[np(1-p)]`

Retrieved from:
By Deborah J. Rumsey from Statistics For Dummies, 2nd Edition
http://www.dummies.com/how-to/content/how-to-find-the-mean-variance-and-standard-deviati.html