Sample question:
The random variable x is the number of houses sold by a realtor in a single month at the real-estate office. Its probability distribution is:
Houses sold (x)
0
1
2
3
4
5
6
7
Probability P(x)
0.09
0.24
0.21
0.17
0.03
0.15
0.09
0.02
a. Compute the mean of the random variable.
b. Compute the standard deviation of the random variable.