Question

the mean of 20 observation is 63 if an observation 50 is replaced by 90 find the mean​

Answer 1

Answer:

Heyaa♡♡

Here is the answer -

$mean \: of \: 20 \: observations \: = \frac{sum \: of \: the \: observation}{no. \: of \: observation} \\ = > 63 \: = \frac{sum \: of \: the \: observtion}{20} \\ = > sum \:of \: the \: observation \: = 63 \times 20 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = > 1260$

Observation 50 is replaced by 90.

Then, new sum:-

$1260 - 50 + 90 \\ = > 1300$

And, new mean:-

$\frac{1300}{2} \\ = > 650$

Hope it helped you.

Answer 2

Step-by-step explanation:

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