Question

The average height of 40 students is 150cm. It was later detected that one observation 165cm was wrongly copied as 125cm for tge computation of mean. Find tge correct mean heigt.

Answer 1

let the sum of other 39 students height is X .then X+125/40=150,then X=5875 now correct mean height( 5875+165)/40=151

Answer 2

Answer:

151 cm

Step-by-step explanation:

The average height of 40 students is 150cm.

Average = (Sum of all heights )/(No. of students)

150= Sum of all heights /40

6000 = Sum of all heights.

Now we are given that one observation 165cm was wrongly copied as 125cm

So, new sum = 6000 -125 + 165 = 6040

So, new mean = 6040/40

                        =151

Hence the new mean is 151 cm