Question

The average height of 10 students in a class is 125cm.if a student who is 124cm tall joins the class, the average height of the class will be

Answer 1

The answer will be

= 125 + 124

= 249

* average height will be 249 cm

Answer 2

Given : The average height of 10 students in a class is 125cm.

A student who is 124cm tall joins the class,

To Find : the new average height of the class

Solution:

$\text{Mean}=\frac{\text{sum of all the obervations}}{\text{number of the observations}}$

Mean height = 125 cm

Number of students  = 10

Total Height of Students  =  125 * 10  = 1250 cm

A student who is 124cm tall joins the class,

Number of students = 10 + 1 = 11

Total New Height = 1250 + 124  = 1374 cm

new average height of the class  = 1374/11

≈ 124.91

the average height of the class will be about   124.91 cm

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