1. The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 420, the standard deviation 59. What is the area under the normal curve between 420 and 495?

0.3982 0.5000 0.0398 0.8982

2. If the variance is 3.9 grams, what is the standard deviation? 1.975 0.05 5.65 15.21

3.In a management trainee program, 80% of the trainees are female, 20% male. A total of 90% of the females attended college, while 78% of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a female who did attend college? 0.25 0.20 0.08 0.72

4.The mean of a normally distributed group of weekly incomes of a large group of executives is $1,060 and the standard deviation is $97. What is the z-score for an income of $1,587? 10.00 0.50 2.00 5.43

5.For a standard normal distribution, what is the probability that z is greater than 1.85? 0.0882 0.0322 0.1176 0.0588

6.

A study of 198 computer service firms revealed these incomes after taxes:

Income After Taxes	Number of Firms
Under $1 million	102
$1 million upto $20 million	60
$20 million and more	36

What is the probability that a particular firm selected has $1 million or more in income after taxes? 0.94 0.48 2.67 1.60