Question

5. The mean of seven numbers is 45. If one number is excluded, then the mean becomes 42. Find the number
taken away. ​

Answer 1

Answer:

3 number has been taken away

Step-by-step explanation:

of I am right then mark as brainlist

Answer 2

Hello mate..

$\huge\mathfrak\underline\red{Solution :}$

Given:

• Mean of seven numbers = 45.
• Mean of six numbers = 42. (As one number got excluded, 7 - 1 = 6.)

To Find:

The excluded number.

SOLUTION:

Mean of seven numbers = 45.

Sum of seven numbers = 45 × 7

=> 315.

Since, one number got excluded;

Mean of six numbers = 42.

Sum of six numbers = 42 × 6

=> 252.

Then,

The excluded number = Sum of seven numbers - Sum of six numbers.

=> 315 - 252

=> 63.

∴The excluded number is 63.

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