The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:
A) 39 B) 39.7 C) 40.3 D) 42.7
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Answer:
39.70
Sum of all observations=40*100=4000
NOW WE WILL SUBTRACT 4000-83+53=4000-30=3970
new mean = 3970/100=39.7
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