The table below represents a probability distribution with a missing value for x. Use that information for parts a and b.
х
11
43
P(x)
0.25
0.26
0.10
0.28
0.11
76
A
90
a. Given that the probability distribution has a mean (u) of 53.27 find the missing value A. (3
points)
b. Compute the standard deviation (0), of the probability distribution constructed in part
a. (round to 4 decimal places) (2 points)