Question

avarage of 6numbers is 8 what number should be added to it to make the average​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Average of 6 numbers is 8.

Let the 6 numbers be a

1

,a

2

...a

6

∴(

i=1

∑

6

a

[

i])÷6=8

⇒

i=1

∑

6

a

i

=8×6

⇒

i=1

∑

6 a =48

If a 7th number is added to the existing 6 numbers,

then the average should be 9.

Let the 7 th number be a .

⇒( i=1∑7 a i )÷7=9

⇒ i=1∑6 a i +a 7 =9×7

⇒a 7=63−48

⇒a 7

=15