1. Theage in United Stateshas a normal distribution with a mean46years and standard deviation13 years. The children are classified as those younger than 18 years and the middle age citizens are those in the age group 18-55.If a citizen is randomly chosen, what is the probability that he/she is middle age..

a. approximately 74%

b. approximately 75%

c. approximately 26%

d. approximately 25%

2.The monthly production of the Happy Children factory has a normal distribution with a mean 3664 toys and standard deviation 400 toys. Their goal for next month is to make at least 3200 toys. What is the approximate probability they will do so.

a. 88%

b. 12%

c. 90%

d. 10%