Question

If mean of ....please telll​

Answer 1

Answer:

The answer is 0.

For any number of observation, the sum of mean differences or differences of each observation from mean add up to 0. This is because the mean is a sort of central number. You can prove it by taking n observations and substracting each observation from the mean.

Please mark it as brainliest.

Answer 2

Answer:

x

1

,x

2

,x

3

,.........x

20

Total no. od terms =20

Mean (

x

ˉ

) of the given data-

x

ˉ

=

20

∑

i=1

20

x

i

Given that mean of given data is 25.

∴

20

∑

i=1

20

x

i

=25

⇒∑

i=1

20

x

i

=25×20

Now,

∑

i=1

20

(x

i

−25)

=∑

i=1

20

x

i

−∑

i=1

20

25

=(25×20)−(20×25)

=0