Estimate the mean exam score for the 50 students in Prof. Burke's class. Score

f

40 but less than 50

21

50 but less than 60

39

60 but less than 70

40

70 but less than 80

34

80 but less than 90

28

Total

162

Group of answer choices

65.56

63.78

64.89

62.34

Hint: To find the mean marks from the given data, we have to convert it into frequency distribution. We can write below 10 as 0-10, below 20 as 10-20 and so on. The corresponding frequencies ( fi) can be found by subtracting the previous number of students from the current number of students.

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step-by-step explanation: