the random variable x represents the number of computers that families have along with the corresponding probabilities. Find the mean, variance, and standard deviation for the random variable x. x=0, 1,2,3,4 P(x)= 0.49,0.05,0.32,0.07,0.07

Question

the random variable x represents the number of computers that families have along with the corresponding probabilities. Find the mean, variance, and standard deviation for the random variable x.  x=0, 1,2,3,4  P(x)= 0.49,0.05,0.32,0.07,0.07

anonymous · Answer

multiply x with its probabilty and sum them all .. you will get mean

anonymous · Answer

then calculate varince with the help of following formula

anonymous · Answer

you can find example here for this http://www.stat.yale.edu/Courses/1997-98/101/rvmnvar.htm