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Average points scored per game were found for a sample size of 90 for 2010 NBA basketball players and classified as follows:

Average points scored per game were found for a sample size of 90 for 2010 NBA basketball players and classified as follows:

Average points scored per game Cumulative frequency
0-6 18
6-12 63
12-18 81
18-24 90

The mean is 10.2

What is the standard deviation of the points per game for this sample?
a.)5.23
b.)5.26
c.)27.36
d.) 27.67
e.)272.92

I know the answer is 5.26 please explain in detail how you got this answer.
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standard deviation.doc

Average points scored per game were found for a sample size of 90 for 2010 NBA basketball
players and classified as follows:
Average points scored per game Cumulative frequency
0-6 18
6-12 63
12-18...

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