Question

The average height of 40 students is 150 cm. it was later detected that one observation 165 cm was wrongly copied as 125 cm for computing the mean. find the correct mean height ? PLEASE ANWSER.............

Answer 1

151cm
$(40 \times 150) - 125 + 165 = 6040 \\ 6040 \div 40 = 151$

Answer 2

Hi friend
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Your answer
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Average height of 40 students = 150 cm (Incorrect mean)

Total sum of height of 40 students = (150×40) cm = 6000 cm

Wrong observation = 125 cm

Correct observation = 165 cm

Correct sum total of heights of 40 students = ( 6000 - 125 +165) cm = 6040 cm

Correct mean = 6040/40 cm = 151 cm

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