The mean and standard deviation of 100 observations were calculated as 40 and 5.1 respectively by a student who took by mistake 50 instead of 40 for one observation.what are the correct mean and standard deviation?
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Answer:
The mean would be 3.9
Step-by-step explanation:
100 x 40= 400
400-50=350 Because the incorrect observation was 50
350+40=390 Because the correct observation was 40
390 divided by 100=3.9
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