Question

The following data are to be used for answering this question 20 1 5 1 9...

The following data are to be used for answering this question

20 1 5
1 9 9
10 2 6
 

What is the variance of this population of scores?

5.6
30
32
36
288

Homework Answers

Answer #1

Solution :

Data : 20 , 1, 5 , 1 , 9 , 9 , 10 , 2 , 6

n = 9

mean = = x / n = (20 + 1 + 5 + 1 + 9 + 9 + 10 + 2 + 6) / 9

= 63 / 9

= 7

mean = = 7

variance = (x - )2 / n

= (20 - 7)2 + (1 - 7)2 + (5 - 7)2 + (1 - 7)2 + (9 - 7)2 + (9 - 7)2 + (10 - 7)2 + (2 - 7)2 + (6 - 7)2 / 9

= 288 / 9

=32

The variance of this population  of scores = 32  

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