Questions

1) Assume breast cancer affects 0.004 of the female population between 45 and 55 years of age.

There are two kinds of positive test results:

-True positive ( the text indicates that you have a disease, and you have it)

-False-positive ( the text indicates that you have a disease, but you do not)

assume mammograms are :

-0.90 are accurate in detecting people who have breast cancer ( true positive rate).

0.93 accurate for people who do not have breast cancer ( true negative rate).

.

Compute the probability that female between the ages of 45 and 55 who tests positive for breast cancer has breast cancer. And enter your answer with three decimal places.

2) Blue Crabs lengths have a normal distribution with a means of 5 inches and a standard deviation of 2 inches. What is the Z value of 9 inches? Round to 3 decimal digits.