The mean of 20 observations is 55. If 4 is
added in 10 observations and 2 is subtracted
from remaining 10 observations, what will be
the new mean?
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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
Step-by-step explanation:
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