The average height of 20 students in a class was calculated as 160 cm. On verification it was found that one reading was wrongly recorded as 132 cm instead of 152 cm. Find the correct mean height.

GIVEN: Total no of students = 20

Average/mean = 160cm

FORMULA USED: Average =

Number of students = 20

Sum of height of all students of class =

Average × Number of students

= 160cm×20

= 3200cm

If one reading wrongly recorded is 132cm instead of 152cm

Then we have to subtract 132cm from the sum

And also add 152 in the sum to replace the height of student

= 3200cm – 132cm + 152cm

= 3220cm

Average/mean =

Mean = = 161cm

CONCLUSION: Mean height of class is 161cm.