Question

the mean of 10 observation is 45.which number should be added so that the new mean becomes 15​

Answer 1

Explanation:

The mean of 10 observation is 20. if each observation is added by

′

5

′

. Find the mean of new observation.

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ANSWER

Given Mean of 10 observations is 20

⟹Sum of 10 observations is S=20×10=200

If each observation is added by 5 Then sum of observations is added by 5×10=50

⟹S

′

=200+50=250

Mean of new observation is

10

S

′

=

10

250

=25

Answer 2

Answer:

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