Question

The mean of 15 observations is 250. If one observation is excluded, the mean of the remaining observations is 248. Find the value of the excluded observation (3)​

Answer 1

Answer:

ˉ

=25

n=8

x

ˉ

=

n

∑x

∑x=

x

ˉ

n=25×8=200

If one observation is removed, then new ∑y=∑x−11=189.

Now, n=7 [∵One observation is removed.]

∴

y

ˉ

=

n

∑y

=

7

189

=27

Step-by-step explanation:

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