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Multiple Choice Questions

Average height of 30 students is 150 cm it was later found the one observation is 165 which was wron...........

Quantitative Aptitude (CSC) Average

Average height of 30 students is 150 cm it was later found the one observation is 165 which was wrongly copied as 135 cm. Find the correct mean height.

152 cm

155 cm

151 cm

153 cm

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Explanation:

Average height=m=150cm
no of students =n=30
new mean =(m*n+165-135)/n
=(150*30+165-135)/30
=(4500+30)/30
=4530/30 = 453/3 =151
Hence, option 3 is the correct answer.

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