Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number

022-62211530

Mon to Sat - 11 AM to 8 PM

the mean of 25 observations is 36.Out of these observations, the mean of first 13  observations is 32 and that of last 13 observations is 40, find the 13th observation ?

Asked by nisha_vini29 25th January 2016, 11:22 AM
Answered by Expert
Answer:

begin mathsize 14px style M e a n space o f space 25 space o b s e r v a t i o n s equals 36 rightwards double arrow S u m space o f space 25 space o b s e r v a t i o n s equals 25 cross times 36 equals 900  M e a n space o f space f i r s t space 13 space o b s e r v a t i o n s equals 32 rightwards double arrow S u m space o f space f i r s t space 13 space o b s e r v a t i o n s equals 13 cross times 32 equals 416  M e a n space o f space l a s t space 13 space o b s e r v a t i o n s equals 40 rightwards double arrow S u m space o f space l a s t space 13 space o b s e r v a t i o n s equals 13 cross times 40 equals 520  N o w comma space 13 t h space o b s e r v a t i o n equals s u m space o f space f i r s t space 13 space o b s e r v a t i o n s plus S u m space o f space l a s t space 13 space o b s e r v a t i o n s space minus S u m space o f space 25 space o b s e r v a t i o n s equals 416 plus 520 minus 900 equals 36 end style

Answered by Expert 25th January 2016, 6:02 PM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Your answer has been posted successfully!

Chat with us on WhatsApp