The-sum-of-a-sample-of-20-numbers-is-320-and-the-sum-of-their-squares-is-5840-Calculate-the-mean-of-the-first-nineteen-numbers-if-the-20-th-observation-is-25-

Question Number 171499 by MathsFan last updated on 16/Jun/22

The sum of a sample of 20 numbers is

320 and the sum of their squares

is 5840 . Calculate the mean of the

first nineteen numbers if the 20^{th}

observation is 25 .

Answered by Rasheed.Sindhi last updated on 16/Jun/22

S u m o f 20 n u m b e r s = 320

\underline{20 t h n u m b e r = 25}

S u m o f r e m a i n i n g 19 n u m b e r s

= 320 - 25 = 295

M e a n o f 19 n u m b e r s = \frac{295}{19} = 15 \frac{10}{19}

Commented by MathsFan last updated on 16/Jun/22

t h a n k y o u v e r y m u c h s i r