A company had 80 employees whose salaries are summarized in the frequency distribution below

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3. A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. Find the standard deviation of the data summarized in the given frequency distribution.
Salary Number of Employees
5,001 -10,000 11
10,001 - 15,000 13
15,001 - 20,000 20
20,001 - 25,000 17
25,001 - 30,000 13

4. The heights of a group of professional basketball players are summarized in the frequency distribution below. Find the standard deviation.
Height (in.) Frequency 
70-71 4  
72-73 9  
74-75 18  
76-77 11  
78-79 9  
80-81 4  
82-83 1  
heights frequency class midpoint x f*x f*x^2
70-71 4 70.5 282 19881 
72-73 9 72.5 652.5 47306.25 
74-75 18 74.5 1341 99904.5 
76-77 11 76.5 841.5 64374.75 
78-79 9 78.5 706.5 55460.25 
80-81 4 80.5 322 25921 
82-83 1 82.5 82.5 6806.25 
totals 56 4228 319654
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