Let X be a normally distributed random variable with a mean of 12 ...

[melly21297]

Let X be a normally distributed random variable with a mean of 12 and a standard deviation of 1.5 . What proportions of the values of X are:
 a. less than 14
  b. more than 8
  c. between 10 and 13

Question 2

Researchers studying the effects of a new diet found that the weight loss over a one-month period by those on the diet was normally distributed with a mean of 10 pounds and a standard deviation of 5 pounds. If a dieter is selected at random, what is the probability that the dieter lost more than 7.5 pounds?

[itsakadoozi]

Answer to Question 1

a. 0.9082
b. 0.9962
c. 0.6568

Answer to Question 2

0.6915

[melly21297]

Excellent

[dantucker]

Wow, this really help