Question

the Arithmetic mean of 12 observation is 7.5 if the arithmetic mean of 7 of this observation is 6.5 the mean of the remaining observation is?​

Answer 1

the mean of remaining observation is 8.9.

Step-by-step explanation:

since we have given that

Number of observation is = 12

Arithmetic means = 7.5

so it becomes,

Number of observation = 7

means = 6.5

so it becomes,

so the mean of remaining observation

would be

hence the mean of remaining

observation is 8.9.

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Answer 2

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the mean of the remaining observation is 8.9

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