find the variance and standard deviation for the following 6 7 10 12 13 4 8 12
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Answer:
mean is equal to 72/8 = 9
Step-by-step explanation:
1. x- x*= a. 6-9= -3
7-9= -2
10-9=1
12-9=3
13-9=4
8-9=-1
12-9=3
2.( x- x*)^2= a. (-3)^2 =9
4
1
9
16
1
9
3. f × (x-x*)^2 = 72
32
8
72
128
8
72
total is 392
so variance = summation over f(x-x*)^2/ summation over f
=392/8 = 49
standard deviation is square root of 49 that is 7
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