Hi can someone please help with this, by using the formula of z-scores and z-scores table. Thank you so much!

Question

If the systolic blood pressure of obese people has a mean of 132 and standard deviation of 8, find the probability that a person have the following blood pressure. Assume the variable is normally distributed:

1. above 120
2. below 150

Answer 1

Above 120

120 has Z score (120 - 132) / 8 = -1.5

Look up Z = -1.5 and read off area (this is area to left of Z = -1.5)

subtract the area from 1

below 150

150 has Z score (150-132) / 8 = 2.25

Look up Z = 2.25 and read off the area

This is the probability