Question

The mean of nine observations is 15. If a new observation 25 is included,
the mean of all ten observations is​

Answer 1

Answer:

Mean of ten observations – Mean if nine observations = Tenth observation

= 10 \times 17 – 16 \times 9

= 170 – 144 = 26

Hence option [C] is correct answer.

Answer 2

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Answer:

Mean of ten observations – Mean if nine observations = Tenth observation

= 10 \times 17 – 16 \times 9

= 170 – 144 = 26

Hence option [C] is correct answer.