Keystone Data Review

Everyone in Sebastian’s class was assigned the same novel to read. A week after the assignment was given, Sebastian asked 8 classmates how many chapters of the novel they had read. His data are shown below.

0 2 3 4 4 6 10 14

What is the third quartile of Sebastian’s data?

• 3

• 6

• 8

• 10

Isabella participated in a quiz competition that had a total of 150 participants. Isabella’s score in the competition was equal to the third quartile of all the scores. Nobody else in the competition had the same score that Isabella had. How many people in the competition had a higher score than Isabella had?

• 37

• 50

• 100

• 147

Derek did yard work for 12 weeks last summer to earn extra money. He earned $12 per hour. He worked a different number of hours each week. He recorded the number of hours he worked each week and used the data to make the box-and-whisker plot shown below.

In how many of the 12 weeks last summer did Derek earn more than $192?

• 0

• 3

• 6

• 9

A soccer coach recorded how many hours, rounded to the nearest hour, each of 12 soccer players practiced for last week. The first quartile of the data was 7.5. Which statement must be true?

• Exactly 3 of the 12 soccer players practiced for at least 7.5 hours last week.

• Exactly 3 of the 12 soccer players practiced for between 7 and 8 hours last week.

• Exactly 9 of the 12 soccer players practiced for at least 7.5 hours last week.

• Exactly 9 of the 12 soccer players practiced for between 7 and 8 hours last week.

A restaurant owner recorded the amount of money spent per person for the 30 most recent customers. The owner calculated the measures of central tendency shown below.

· mean: $16.11

· median: $19.72

Based on the data, what is the total amount of money the restaurant owner should expect the next 30 customers to spend at the restaurant?

• $108.30

• $295.80

• $483.30

• $591.60

Talia recorded how long it took her to run 400 meters in each of her last 8 races. Her times, rounded to the nearest tenth of a second, are listed below.

62.1 60.9 60.4 60.2 60.0 58.5 57.4 57.4

What is the median, in seconds, of Talia’s times?

• 59.6

• 60.0

• 60.1

• 60.2

A data set is shown below.

104 108 111 114 114

120 122 126 127 134

What is the first quartile value of the data set?

• 111

• 117

• 118

• 124

The line of best fit for a scatter plot is described by the equation y = 9.55x + 99.4. What is the predicted y-value when the x-value is 10?

• 194.90

• 9.4

• 95.5

• 99.85

A store owner buys baseball cards in bulk. The owner recorded the amount (y), in dollars, she paid for each of the last 10 collections she bought based on x thousand cards in each collection. She used that data to calculate the line of best fit with the equation shown below.

y = 39.94x + 3.84

Based on the store owner’s line of best fit, what amount should she expect to pay for a collection that has 1,500 cards?

• $45.28

• $45.70

• $59.91

• $63.75

Brent works at a tire store. He recorded the number of tires sold each day for two weeks in the stem-and-leaf plot below.

What is the median of the number of tires sold each day?

• 100

• 117

• 121

• 124