Question

the mean of 1²,2²,3²,4²,5²,6²,7² is?

Answer 1

Mean of any observation is defined as the -
Arithmetic sums of events / no. of events

Here -

observations : 1² , 2² , 3² , 4² , 5² , 6² , 7²

Arithmetic sums - 1² + 2² + 3² + 4² + 5² + 6² + 7² = 1 + 4 + 9 + 16 + 25 + 36 + 49 = 140

Aslike - Arithmetic sums : no. of observations

No. of observations = 7

Hence , required mean = 140 / 7 = 20

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Answer 2

Answer Is 20 ...1^2 is 1 .2^2 is 4.3^2 is 9. 4^2 is 16 .5^2 is 25 .6^2 is 36 and 7^2 is 49. Then 1+4+9+16+25+36+49=140. Mean Means Average... Average = 140/7=20...