For a normal distribution with a mean of 7.5 and a variance of 9, find the following:
P(x greater than or equal to 8.5)
=1 - P(Z less than or equal to (8.5-7.5)/3)
=1 - P(1/3)
1/3 on the z-score table is 0.6293
=1 - 0.6293
=0.3708
Is that correct? If not, what am I doing wrong? All help appreciated!