Question 123
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.
Solution
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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