Question

the average height of 100 1st pu students is 160cm and that of 150 2nd pu is 155cm. Find the combined average height of 1st and 2nd pu students​

Answer 1

Step-by-step explanation:

Given the average height of 20 students in a class was 160 cm

Then, total height of 20 students =160×20=3200

But in average, one reading was wrongly recorded as 132 cm instead of 152 cm

Then difference of height wrongly recorded =152−132=20 cm

Then total height of 20 students after correction =3200+20=3220 cm

Then correct mean height =

20

3220

=161 cm