b) The mean of 10 observations was calculated as 40. On rechecking, it was
detected that the number 45 was incorrectly copied as 15. Find the correct mean.
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7
Answer:
43
Step-by-step explanation:
mean of 10 observations = 40
sum of 10 observations = 40 × 10 = 400
correct sum = 400-15+45 =430
correct mean = 430/10 = 43
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