Question

the average height of 12 students in a class is 150 cm and the average height of the remaining 18 students in the class is 180 cm what is the average height of a student in that class

Answer 1

the average height=150+180
= 330cm

Answer 2

Answer: 168 cm

Step-by-step explanation:

Given:- The average height of 12 students in a class is 150 cm.

Then, the sum of heights of 12 students=$12\times150=1800\ cm^2$

The average height of the remaining 18 students in the class is 180 cm.

The, the sum of heights of remaining 18 students in the class=$18\times180=3240$

Now, the total number of students in the class (n)=$12+18=30$

The total sum of the heights of students in the class S(n)=$1800+3240=5040$

Now, the average height of a student in that class=$\frac{S(n)}{n}=\frac{5040}{30}=168\ cm$