The average of 42 observations is 69.5. if the average of first 15 observations is 63 and that of last 19 observations is 74, what is the average of remaining 8 observations ?
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sum of 42 terms=42×69.5=2919
sum of 1st 15 terms= 15×63= 945
sum of last 19 terms = 19×74= 1406
sum of remaining 8 terms = 2919-(945+1406)
=2919-2351= 568
mean of 8 terms = 568÷8=71
sum of 1st 15 terms= 15×63= 945
sum of last 19 terms = 19×74= 1406
sum of remaining 8 terms = 2919-(945+1406)
=2919-2351= 568
mean of 8 terms = 568÷8=71
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