What is the arithmeticmean of 2,3,1,9 ?

The arithmeticmean of 2,3,1,9 is 3.75

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arithmeticmean of 2,3,1,9

average

2, 3, 1, 9

3.75

Solution steps

Compute the sum of the data set:

i = 1 \sum n a_{i} = 15

Compute the number of terms in the data set:

n = 4

Divide the sum by the number of terms and simplify:

3.75

= 3.75

C (2, 2)

5, 9.5, 18.5, 29.5, 41, 52.5, 74.5

1, 2, 3, 4, 8, 8, 10, 16, 20

60 n C r 6

74, 58, 68, 78, 72, 68, 64, 64, 66