Find the standard​ deviation, s, of sample data summarized in the frequency distribution table given below by using the formula​ below, where x represents the class​ midpoint, f represents the class​ frequency, and n represents the total number of sample values.​ Also, compare the computed standard deviation to the standard deviation obtained from the original list of data​ values, 9.0. s=
n∑f•x2−∑(f•x)2
n(n−1)
Interval
20​-26
27​-33
34​-40
41​-47
48​-54
55​-61

Frequency
1
21
44
17
10