Question 1182500
48, 47, 64, 56, 54, 58, 51, 63, 61, 70
Sum of observations =572
Number of observations 10
Mean = 57.2

 take each number, subtract the mean and square the result
48-57.2 = -9.2
47-57.2= -10.2
similarly for all of them we get
-9.2
-10.2
6.8, 
-1.2,
-3.2,
 0.8,
-6.2, 
5.8, 
3.8, 
12.8

Take the square of the above differences Example -9.2 ^2 = 84.64
we get
84.64, 104.04, 46.24, 1.44, 10.24, 0.64, 38.44, 33.64, 14.44, 163.84

Add the difference ^2
we get
497.6
Variance = 497.6 / 10  ( the count)= 49.76

standard deviation = {{{sqrt(variance)}}}

 = 7.054