1. The following histogram shows the scores on the first exam for a statistics class.

a. How many students took the exam?

b. What is the class interval?

c. What is the class midpoint for the first class?

d. How many students earned a score of less than 70?

2. A data set consists of 83 observations. How many classes would you recommend for a frequency distribution?

3. Molly's Candle Shop has several retail stores in the coastal areas of North and South Carolina. Many of Molly's customers ask her to ship their purchases. The following chart shows the number of packages shipped per day for the last 100 days.

a. What is this chart called?

Frequency polygon

Histogram

Bar chart

b. What is the total number of frequencies?

c. What is the class interval?

d. What is the class frequency of the 0 up to 5 class?

e. What is the relative frequency of the 0 up to 5 class?

f. What is the midpoint of the 20 up to 25 class?

g. On how many days were there 20 or more packages shipped?

4. A set of data contains 53 observations. The minimum value is 42 and the maximum value is 129. The data are to be organized into a frequency distribution.

a. How many classes would you suggest?

b. What would you suggest as the lower limit of the first class?

5. In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?

6. A pie chart shows the relative market share of cola products. The "slice" for Pepsi-Cola has a central angle of 90 degrees. What is its market share?