a. Find the probability that a randomly selected sample mean is between 85 and 87. Use
Geogebra to find the each of the following probabilities.
83.84
84.92
86
87.08 88.16
+
89.2
85
87
X
x
x
a
P(85
=
Round your answer to four decimal places
b. Find the value that is two standard deviations above the expected value of the sample m
Round your answer to one decimal place as needed
