I WILL YOU MARK YOU AS BRAINLIEST if the mean of five observations x , x+2 , x+4,x+6,x+6 is 11 find the mean of first three observation
Answers
Answered by
1
Note: it should be x + 8 instead of x + 6. It follows a series.
Given observations are x, x + 2, x + 4, x + 6, x + 8 = 11.
Total observations = 5.
mean = 11.
Now,
We know that Mean = Sum/Total number of observations
⇒ 11 = (x + x + 2 + x + 4 + x + 6 + x + 8)/5
⇒ 55 = 5x + 20
⇒ 35 = 5x
⇒ x = 7
Mean of first three observations = (x + x + 2 + x + 4)/3
⇒ (3x + 6)/3
⇒ 3(x + 2)/3
⇒ x + 2
⇒ 7 + 2
⇒ 9.
Therefore, Mean of first three observations = 9.
Hope it helps!
siddhartharao77:
:-)
Answered by
0
You are written x+6 two times. I think one x+6 is x+8 if so following is the answer
(x+x+2+x+4+x+6+x+8)/5 = 11
5x + 20 = 55
5x = 55 - 20
x = 35/5 = 7
three observation = x,x+2,x+4 = 7,9,11
mean = (7+9+11)/3 = 9 0r (x+x+2+x+4)/3 = (3x+6)/3 = (21+6)/3 = 27/3 = 9
Similar questions