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Introduction to Statistics

The mean of 4...

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The mean of 40 observations was 160. It was detected that the value of 165 was wrongly copied as 125. Find the correct mean

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Q. The mean of 40 observations was 160. It was detected on rechecking that the value of 165 was wrongly copied as 125 for computation of mean. Find the correct mean.

40

observations was given as

160

.It was detected that

125

160

. Find the correct mean.

Q. The average height of

30

boys was calculate to be

150 c m

. It was detected later that one value of

165 c m

was wrongly copied as

135 c m

for the computation of the mean. Find the correct mean.

Q. A student obtained the mean and standard deviation of 100 observations as 40 and 5.1 respectively. It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and S.D.

Q. A student obtained the mean and standard deviation of 100 observations as 40 and 5.1 respectively. It was later found that one observation was wrongly copied as 50 instead of 40. Find the correct mean and standard deviation.

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