Question

1 The average of 20 values is 18. It 3 is substra
-ched from each of the value then what will
be the new average ?
(A) 16tho (6) 17 (6) 15. (d) 21
?​

Answer 1

Answer:

15

Step-by-step explanation:

sum of 20 values=18×20=360

sum of 20 values after substraction of 3from each

=360-(20×3)

=360-60

=300

new average=300/20=15

Answer 2

_________________________

$\: \\ \:$

Given :—

$\:$

• The average of 20 values is 18.

$\:$

To Find :—

$\:$

• If 3 is subtracted from each of the value then what will be the new average?

$\:$

Solution :—

$\:$

It's given that the average of 20 values is 18 and 3 is subtracted from each value. Firstly, we will find the value of the sum of 20 values then multiply the 20 with 3 and then subtract the sum of 20 values with the product of 20×3. At last We will find the new average.

$\:$

★ Sum of 20 values = 18.

So,

$\:$

» 18 × 20 = 360

$\:$

now, we have to subtract 3 from each value. So,

$\:$

» 360 - ( 20 × 3 ) [ as mentioned above ]

$\:$

» 360 - 60

$\:$

» 300

$\:$

★ Finding the new average :–

$\:$

» 300/20

$\:$

» 15

$\:$

$\begin{gathered}{ \underline{ \red{ \boxed{ \tt{Therefore, \: the \: new \: average \: is \: 15}}}}} \end{gathered}$

$\: \\ \:$

_________________________