The mean of first 5 observations is 20 and the mean of last 5
observations is 45. What is mean of all 10 observations?
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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
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