Lesson 9 - Averages, Median, Mode, and Range

For the first 7 days of January, the daily low temperatures for Burlington were 20, 14, 9, 8, -8, -11, and -4 degrees Fahrenheit. What was the average daily low temperature, in degrees Fahrenheit, for those 7 days?

• -1 degrees

• 1

• 4

• 6

To determine a student's overall homework score for the semester, Mr. Daley drops the 2 lowest homework scores and takes the average of the remaining homework scores. Payton earned the following homework scores in Mr. Daley's class this semester: 85, 56, 67, 90, 95, 86, 0, 83, 100, and 88. What is the overall homework score that Payton earned?

• 69.4

• 77.1

• 86.8

• 99.1

Sydney earned 91, 93, 93, 94, and 96 points on the 5 essays - each out of a total of 100 points - given so far this semester. How many points must she earn on her sixth essay, which is also out of 100 points, to average 90 points for the six essays assigned this semester?

• 73

• 80

• 86

• 90

What is the mean of the following scores? 5, 93, 64, 45, 58, 13, 58

• 46

• 48

• 52

• 54

What is the average of 4, 4, and 5?

• 4 1/3

• 4 1/2

• 5

• 5 2/3

George was absent for the last accounting test. For those who took the test, the mean was 75.8, the median was 74, and the mode was 81. When George took the test later, his score was different from all the other students' scores, and the class mean went up to exactly 76.6. What effect, if any, did George's score have on the class mode?

• None, the mode stayed the same.

• It decreased the mode exactly 0.8 points.

• It increased the mode exactly 0.8 points.

• The effect of George's score on the mode cannot be determined from the given information.

What is the median of the following 9 numbers? 66, 29, 31, 49, 65, 13, 80, 13, 24

• 13

• 31

• 41.1

• 65

Caitlin has earned the following scores on four 100-point tests this year: 94, 81, 87, and 90. What score must Caitlin earn on the fifth and final 100-point test to earn an average score of 90 for the 5 tests?

• 90

• 92

• 96

• 98

Julia started exercising August 1 because she wanted to prepare for volleyball season. For 7 days, she recorded the number of push ups she did each day. 50 push ups on the 1st day, 75 on the 2nd and 3rd, 100 on the 4th, 130 on the 5th, 140 on the 6th, and 165 on the 7th day. What was the range of push ups Julia did during the first 7 days of August?

• 75

• 100

• 105

• 115

The quarterly sales totals (in thousands of dollars) for a company over a 4-year period were recorded. The company's CEO set a sales goal of $140,000 for the quarterly average in 2008. To meet this goal, what must be the minimum fourth-quarter sales in 2008, in thousands of dollars? Use the following information: Quarter 1 in 2005-85, in 2006-100, in 2007-122 and in 2008-140. Quarter 2 in 2005-89, in 2006-107, in 2007-129, in 2008-143. Quarter 3 in 2005-80, 2006-95, 2007-125, 2008-136. Quarter 4 in 2005-93, 2006-115, 2007-134, and 2008-?

• 139

• 140

• 141

• 142