the mean of 10 observation is 3.5. if two observation namely 3.5 and 2.5 are deleted. find the new mean?

So, total value of 10 observations = $3.5\times 10$ = 35

Now, value of 2 observations deleted = 3.5 + 2.5 = 6

Therefore, new mean = mean of 8 observations = $\frac{35-6}{8}=\frac{29}{8}$ = 3.625

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