Mean of 8 observations is 8.Mean of 12 observations is 9.Find the sum of this observations....
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sum of 8 observation =8×8=64
sum of 12 observation= 108
mean =(64+108)/20
=172/20
=8.6
sum of 12 observation= 108
mean =(64+108)/20
=172/20
=8.6
Sathwikabandari:
Tq Aman
Answered by
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sum of observations = mean × total number of observations
= 8 × 8 = 64
sum of 12 observations = 12 × 9 = 108
sum of both observations = 64 + 108 = 172
= 8 × 8 = 64
sum of 12 observations = 12 × 9 = 108
sum of both observations = 64 + 108 = 172
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