standard deviation of a data set

Statistics
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Find the standard deviation of the data summarized in the given frequency distribution.

19) The heights of a group of professional basketball players are summarized in the frequency distribution below. Find the standard deviation. Round your answer to one decimal place.

Height (in.)Frequency
70-713
72-737
74-7516
76-7712
78-7910
80-814
82-831
May 27th, 2015

answer is 2.8 

Get 2.8 by mean and substracting it from all the number and then taking the mean of new set of numbers. 

May 27th, 2015

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May 27th, 2015
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May 27th, 2015
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