1.

Find the variance and standard deviation for the following 6 7 10 12 13 4 8 12​

Answer»

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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