Basic Mathematics for College Students

49. TEMPERATURE CHANGES Temperatures were
    recorded at hourly intervals and listed in the table
    below. Find the average temperature of the period
    from midnight to 11:00 A.M.


50. AVERAGE TEMPERATURES Find the average
    temperature for the 24-hour period shown in the
    table in Exercise 49.

For Exercises 51–54, find the semester grade point average for a
student that received the following grades. Round to the nearest
hundredth, when necessary.

54.

55. EXAM AVERAGES Roberto received the same
    score on each of five exams, and his mean score is 85.
    Find his median score and the mode of his scores.


56. EXAM SCORES The scores on the first exam of the
    students in a history class were 57, 59, 61, 63, 63, 63,
    87, 89, 95, 99, and 100. Kia got a score of 70 and claims
    that “70 is better than average.” Which of the three
    measures of central tendency is she better than: the
    mean, the median, or the mode?


57. COMPARING GRADES A student received scores
    of 37, 53, and 78 on three quizzes. His sister received
    scores of 53, 57, and 58. Who had the better average?
    Whose grades were more consistent?


58. What is the average of all of the integers from
    to , inclusive?


59. OCTUPLETS In December 1998, Nkem Chukwu
    gave birth to eight babies in Texas Children’s
    Hospital. Find the mean and the median of their birth
    weights listed below.


60. COMPARISON SHOPPING A survey of grocery
    stores found the price of a 15-ounce box of Cheerios
    cereal ranging from $3.89 to $4.39, as shown below.
    What are the mean, median, and mode of the prices
    listed?
    $4.29 $3.89 $4.29 $4.09 $4.24 $3.99
    $3.98 $4.19 $4.19 $4.39 $3.97 $4.29

100

 100

7.2 Mean, Median, and Mode 619

Time Temperature Time Temperature

12:00 A.M. 53 12:00 noon 71

1:00 54 1:00 P.M.73

2:00 57 2:00 76

3:00 58 3:00 77

4:00 59 4:00 78

5:00 59 5:00 71

6:00 61 6:00 70

7:00 62 7:00 64

8:00 64 8:00 61

9:00 66 9:00 59

10:00 68 10:00 53

11:00 71 11:00 51

Course Grade Credits

MATH 210 C 5

ACCOUNTING 175 A 3

HEALTH 090 B 1

JAPANESE 010 D 4

Course Grade Credits

NURSING 101 D 3

READING 150 B 4

PAINTING 175 A 2

LATINO STUDIES 090 C 3

Course Grade Credits

ANTROPOLOGY 050 D 3

STATISTICS 100 A 4

ASTRONOMY 100 C 1

FORESTRY 130 B 5

CHOIR 130 C 1

Course Grade Credits

PHOTOGRAPHY D 3

MATH 020 B 4

CERAMICS 175 A 1

ELECTRONICS 090 C 3

SPANISH 130 B 5

Ebuka (girl) 24 oz Odera (girl) 11.2 oz

Chidi (girl) 27 oz Ikem (boy) 17.5 oz

Echerem (girl) 28 oz Jioke (boy) 28.5 oz

Chima (girl) 26 oz Gorom (girl) 18 oz