Question

Average of first five composite number is ____ .

Answer 1

Answer :

The average of first five composite numbers is 37/5.

Explanation :

• The first five composite numbers are 4,6,8,9,10.

Average / mean of numbers

$mean \: = \frac{sum \: of \: observations}{no.of \: observations}$

• Here, Sum of observations = (4 + 6 + 8 + 9 + 10)

• No. of observations = 5

$\implies \: mean \: = \frac{4 + 6 + 8 + 9 + 10}{5}$

$\implies mean \: = \frac{37}{5}$

Therefore, here mean of first five composite numbers is 37/5.

______________________

Composite numbers :

• A integer which is greater than zero ( >0) and the product of two smaller positive integers is known as a composite number .

Composite numbers from 1 to 100 :

4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100.

Answer 2

↪Question :-

• Average of first five composite numbers is ________ .

↪Solution :-

Some important definitions :

1. Composite Numbers : Numbers having more than two factors.
2. Prime Numbers : Numbers having only two factors (1 and itself).
3. Natural number : Counting numbers are called natural numbers.

Now we are going to find Average :

$\boxed{\tt{Average = \dfrac {Sum \:of \: observation}{Number \:of\:observation}}}$

• First five composite numbers = 4,6,8,9 and 10.
• Number of composite numbers = 5

$\sf{ : \implies{Average = \dfrac {Sum \:of \: composite \: numbers}{Number \:of \: composite\:numbers}}} \\ \\ \sf{ : \implies{Average = \dfrac {4 + 6 + 8 + 9 + 10}{5}}} \\ \\ \sf{: \implies {Average = \dfrac {37}{5}}}\\ \\ \sf{: \implies {Average = 7.4}}$

$\bf {\therefore{Average \:of\: first \:five \:composite \:numbers \:is \:7.4.}}$

$\rule{307}{2}$