If the mean of 5 observations is x ,x+2,x+4,x+6 and x+8 is 11 then the mean of the last three observations is? The answer is 7, but can I get a detailed explanation for 5 his problem?
Answers
Answered by
4
Mean=Sum of all observations/Total number of observations
11=x+x+2+x+4+x+6+x+8/5
11=5x+20/5
55=5x+20
5x=35
x=7
Last three observations =7+4,7+6,7+8=11,13,15
Mean of last three observations=11+13+15/3
Mean of last three observations=39/3=13
11=x+x+2+x+4+x+6+x+8/5
11=5x+20/5
55=5x+20
5x=35
x=7
Last three observations =7+4,7+6,7+8=11,13,15
Mean of last three observations=11+13+15/3
Mean of last three observations=39/3=13
gayithri:
Tq guys you are right and I found that the answer given as 7 in my book is a mistake! The publishers were very irresponsible. Anyhow thanks it helped me a looooot :)
Answered by
3
according to ur question the answer of last three observations is 7 . but it can't.
the value of x is 7
but i m sending u .... the solution according to me.
hope this helped!!
the value of x is 7
but i m sending u .... the solution according to me.
hope this helped!!
Attachments:
Tq guys you are right and I found that answer given as 7 in my book is a mistake! The publishers were very irresponsible . Anyhow thanks it helped me a looooot :)
ok....
ur welcome
Similar questions