Consider the grouped sample data to the right.   ​a) Calculate the approximate mean of these sample data.   ​b) Calculate the approximate standard deviation of these sample data.        Values     Frequency         5 to under 10   11       10 to under 15   9       15 to under 20   29       20 to under 25   22       25 to under 30   8

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Consider the grouped sample data to the right.
 
​a) Calculate the approximate mean of these sample data.
 
​b) Calculate the approximate standard deviation of these sample data.
    
  Values  
  Frequency  
 
 
  5 to under 10  
11
 
 
  10 to under 15  
9
 
 
  15 to under 20  
29
 
 
  20 to under 25  
22
 
 
  25 to under 30  
8
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