1. .A manufacturer of batteries claims that the distribution of the lengths of life of its best battery has a mean of 54 months and a standard deviation of 6 months. What is the probability that a random sample has a life of 52 or more months?
2. Draw and find the probabilities for the following:

a. between z= -1.43 and 0.68

b. between z= -1.555 and -0.44

c. z> -2.35

d. z>1.34

e. between 0.58 and 1.74