Question

What is the mean deviation of first 8 composite numbers is what?
Answer is 3
Please give detailed explanation in notebook

Answer 1

Mean is also known as average. Average of any data is given by the sum of data by number of data.

So here we are asked of the mean of first eight composite numbers.

First eight composite numbers are :

4,6,8,9,10,12,14,15

Then mean =

$\frac{sum \: of \: data}{ number \: of \: data} \\ \\ \frac{4 + 6 + 8 + 9 + 10 + 12 + 14 + 15}{8} \\ \\ = \frac{78}{8} =9.75$

The mean so required is 9.75

Answer 2

Answer:-

Average of the data that is sum of the observations by number of observations is Mean.