Question 762913
for this problem, we first calculate P(X<40) and then
P(X>40) = 1 - P(X<40)
to calculate P(X<40), we calculate the associated z-value
z-value = (40 - 50) / 7 =  -1.43
referring to the negative z table values we find that
P(X<40) = .08 and
P(X>40) = 1 - .08 = .92 or 92%