Question

There is 60% chance that a final year student would throw a party before leaving school, taking every 50 student from a total of 150. Find the mean value and the variance.

Answer 1

Solution:

Given, $p=60\%=0.6, n=50$

$Mean=\mu=np=0.6\times50=30 \\Variance=\sigma^2=np(1-p)=0.6(50)(0.4)=12$