1
Question
The mean of 10 observations is 42 If each observation in data is decreased by 12 What will be the new mean of data
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Solution
sum of observations/no. of observations = mean
sum of 10 observations / 10 = 42
sum of 10 observations = 420
When each of the observation is reduced by 12, then
sum of new 10 observations = ( sum of original 10 observations ) - 12 * 10
= 420 - 120 = 300
new mean = 300/10 = 30
sum of observations/no. of observations = mean
sum of 10 observations / 10 = 42
sum of 10 observations = 420
When each of the observation is reduced by 12, then
sum of new 10 observations = ( sum of original 10 observations ) - 12 * 10
= 420 - 120 = 300
new mean = 300/10 = 30
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