Complete probability and find the mean and standard dev.
x=250 P(x) = .40
x= 100 P(x) = .10
x= 250 P(x) = .20
Solution. Denote the mean and standard deviation by a and b, respectively. Then we can complete the probability table as follows.
x=250 P(x) = .40 ...
The expert completes the probability and find the mean and standard deviation.