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Statistics Wording Problem
1. The mean of 10 observations is 12.5 . While calculating the mean one observation was by mistake taken as -8 instead of +8 ...
2. The mean of 10 observations is 35 . While calculating the mean two observations were by mistake taken as 35 instead of ...
3. The mean of 15 observations is 16.4 . If we remove one observation from it then the mean of remaining observations is 17 ...
4. The sum of 15 observation is 343 . If we remove two observation 18 and 26 , then find out the mean of remaining obser ...
5. The mean of 5 observations is 20 . If we add one new observation then the new mean of the observations is 25 . So find o ...
6. The mean of observation is 10 . If we add 2 and then multiply or divide by 3 in each observation, then find the new mean ...
Problem 1 of 6
1. The mean of
observations is
. While calculating the mean one observation was by mistake taken as
instead of
. Find the correct mean.
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Statistics Wording Problem
1. The mean of 10 observations is 12.5 . While calculating the mean one observation was by mistake taken as -8 instead of +8 . Find the correct mean.
Here Mean
X
`= 12.5` and `n = 10`
`Sigma(X) = `
X
` × n = 12.5 × 10 = 125`
`:.` the correct sum `Sigma(X) = 125` - (Wrong Observation) + (Correct Observation)
= 125 - ( -8 ) + ( 8 ) = 141.
`:. "correct mean" = "correct sum" / n = 141 / 10 = 14.1`.
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