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

##### 1 Answer

Feb 18, 2016

The mean of X is u = np

The standard deviation of X is

#### Explanation:

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

- The mean of X is u = np
- The variance of X is
#(sum)^2 = np(1-p)# - 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