1. The distribution of the annual incomes of foremen at the Marvin Window

1.

The distribution of the annual incomes of foremen at the Marvin Window Company approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68% of the incomes lie between what two incomes? 
 

2.

Which of the following is true in a normal distribution? 
 

3.

Tables of normal distribution probabilities are found in many statistics books. These probabilities are calculated from a normal distribution with ___________. 
 

4.

Two normal distributions are compared. One has a mean of 10 and a standard deviation of 10. The second normal distribution has a mean of 10 and a standard deviation of 2. Which of the following is true? 
 

5.

A normally distributed random variable has _________. 
 

6.

The total area of a normal probability distribution is _______. 
 

7.

In an illustration of a normal probability distribution, a shaded area represents _______. 
 

8.

The standard normal probability distribution is unique because it has _________. 
 

9.

The weekly mean income of a group of carpenters is $1,000 and the standard deviation of this group is $100. The distribution is normal. What percent of the carpenters have an income of $925 or less? 
 

10.

A candy bar is normally distributed with a mean of 1,000 grams and a standard deviation of 50 grams. What percent of the candy bars weigh 860 grams or less? 
 

11.

What is a normal distribution with a mean of 0 and a standard deviation of 1 called? 
 

12.

The mean weight of a watermelon plant is 15.0 pounds, and the standard deviation of the normally distributed weights is 1.75 pounds. Of 200 watermelons, how many weighed between 13 and 16 pounds? 
 

13.

The Marvin Window Company estimated that the distribution of the time for two construction workers to install 50 custom window sets is normally distributed with a mean of 32 hours and a standard deviation of 2 hours. What percent of 50 window sets take between 32 and 34 hours to erect? 
 

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