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The mean of 40 observations was 200. It was detected by rechecking that the value of 65 was wrongly copied as 25 for computation of mean. Find the corrected mean.  
Asked by gujarsurjeet007 | 13 Feb, 2018, 08:49: PM
answered-by-expert Expert Answer
begin mathsize 16px style According space to space the space question space straight n equals 40 comma space straight x with bar on top space equals space 200 space straight x with bar on top equals fraction numerator begin display style sum for straight n of straight x end style over denominator straight n end fraction space 200 equals fraction numerator begin display style sum for straight n of straight x end style over denominator 40 end fraction sum for straight n of straight x equals 200 cross times 40 equals 8000 Correct space summation equals 8000 minus 25 plus 65 equals 8040 Correct space mean equals 8040 over 200 equals 40.2 end style
Answered by Sneha shidid | 14 Feb, 2018, 10:10: AM
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CBSE 9 - Maths
The mean of 40 observations was 200. It was detected by rechecking that the value of 65 was wrongly copied as 25 for computation of mean. Find the corrected mean.  
Asked by gujarsurjeet007 | 13 Feb, 2018, 08:49: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
If the mean of 1,2,3,.........x is 6x/7 find the value of x
Asked by The All Purpose World v2.0 | 28 Jan, 2018, 01:10: PM
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