Question

Mean of first 5observation is 12 and last five observation is 15 . Mean of 9observation is 13 .find the middle observation

Answer 1

Hey mate,...

Here's your answer,...

Mean of 9 observation =13
sum=13*9=117

Mean of the first 5 observations i= 12,
Therefore, sum of the first five observations=60

Mean of the last 5 observations=15
sum of abservations=75

As the middle observation is the 3rd one,...

Hence, the third observation is=(60+75)-117
135-117=18

Hope it helped you
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Answer 2

Mean of 9 observations = 13.
Total = 13 × 9 = 117.


Mean of 1st 5 observations = 12.
Total = 5 × 12 = 60.


Mean of last 5 observations = 15.
Total = 5 × 15 = 75.


Mean of middle observation = 60 + 75 - 117
= 135 - 117
= 18.


Hope it helps you.
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