The arm lengths of people are normally distributed with a mean of 64 cm and standard deviation of 4 cm.


a) What is the probability that a chosen person has an arm length greater than 60 cm?


b) What is the probability that a chosen person has an arm length in the range 56 cm to 69 cm.


c) The arm length of 70% of the people are more than x cm. Find the value of x.

Represent the area which illustrates the probability!

EXPLAIN YOUR ANSWERS WITH [A] FORMULA[S}!!!