1. The mean of 19 observations is 24. If the mean of the first 10 observations is 17 and that of the last 10 observations is 24, find the 10th observation.
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By: anil on 05 May 2019 01.59 am
it is given that mean of 19 observations is 24 mean = $$frac{Sum}{Numberof Elements}$$ 24 = $$frac{Sum}{19}$$ Sum = 456 It is given that mean of the first 10 observations is 17 and that of the last 10 observations is 24 Sum of first 10 terms = 17 x 10 = 170 Sum of last 10 terms = 24 x 10 = 240 10th term = (170 + 240 )- 456 = - 46
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