Q. 24.3( 35 Votes )
If the mean of 25
Answer :
Mean of the observation is given by –
Total number of observations = 25
Mean of 25 observation = 27 (Given)
We get
⇒ Sum of 25 observations = 27 × 25 = 675
If each observation is decreased by 7, the Sum gets affected.
New Sum = 675 – (25 × 7) = 675 – 175 = 500
Thus, new mean = 20
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