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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 standard deviation for this population?
a) 11.43
b) 14.14
c) 12.63
d) 13.17
e) 16.90

Answer

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