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Question

An instructor is evaluating the performance of students on a test. He records the number of points that each student missed and created a frequency distribution. This is provided below:
Points missed Number of students
0-under 10 2
10-under 20 4
20-under 30 10
30-under 40 8
40-under 50 6

What is the mean number of points missed?
a) 20
b) 25
c) 29
d) 30
e) 35

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