The mean of 20 observations is 20. If 2 is added in each of first 10 observation then what will be the mean of 20 new observations
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Step-by-step explanation:
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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