Question

7. What is the average of the first 7 composite numbers?
(1) 9 (2) 9.2 (3) 8.8 (4) 10
​

Answer 1

Step-by-step explanation:

first seven composite no are

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

there avg,= (4+6+8+9+10+12+15)/7

=

= 64/7

= 9.2 approx

Answer 2

The average of the first 7 composite numbers is 9

Given :

The the first 7 composite numbers

To find :

The average of the first 7 composite numbers is

(1) 9

(2) 9.2

(3) 8.8

(4) 10

Solution :

Step 1 of 2 :

Calculate Sum of the observations

Here the given first 7 composite numbers are 4, 6, 8, 9, 10, 12, 14

Number of observations = 7

Sum of the observations

= 4 + 6 + 8 + 9 + 10 + 12 + 14

= 63

Step 2 of 2 :

Calculate the average

The required average

= The average of the first 7 composite numbers

$\displaystyle \sf{ = \frac{Sum \: of \: the \: observations}{Number \: of \: observations} }$

$\displaystyle \sf{ = \frac{63}{7} }$

$\displaystyle \sf{ = 9}$

Hence the correct option is (1) 9

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