Question

question number 21 please.

Answer 1

Hey there!

Answer:

49.5

Step-by-step explanation:

Given,

Sum of deviations of x₁, x₂, x₃.....xₙ measured from 50 is -10.

So, x₁ + x₂ + x₃ + .....+ xₙ = 50n - 10 .............(i)

And,

It is also given that:

x₁ + x₂ + x₃ +.......+xₙ = 46n + 70 .............(ii)

Now,

From Equation (i) and (ii):

50n - 10 = 46n + 70

50n - 46n = 70 + 10

4n = 80

n = 20.

Finding Mean:

Mean = (x₁ + x₂+....+x₂₀) / 20

         = (50 * 20 - 10) / 20 = (46 * 20 + 70)/ 20

         = 990 / 20

         = 49.5

Hope It helps You!

Answer 2

Dear friend, The answer is given in the attachment. I hope it helps you! Pls mark the brainliest!