October 14, 2023
October 14, 2023
October 14, 2023
###### NVS PGT CS 2017 Part-B
October 14, 2023
 Question 212
The arithmetic mean of attendance of 49 students of class A is 40% and that of 53 students of class B is 35%. Then the percentage of arithmetic mean of attendance of class A and B is
 A 27.2% B 50.25% C 51.13% D 37.4%
Question 212 Explanation:
The number of class A students are 49
The arithmetic mean of attendance of Class A is 40%
Arithmetic mean of 49 students attendance of Class A is 49×40
The number of class B students are 53
The arithmetic mean of attendance of Class A is 35%
Arithmetic mean of 53 students attendance of Class A is 53×35
The percentage of arithmetic mean of attendance of class A and B is
= (40×49 + 35×53 )/ (49 + 53)=3815/102
= 37.40
Question 212 Explanation:
The number of class A students are 49
The arithmetic mean of attendance of Class A is 40%
Arithmetic mean of 49 students attendance of Class A is 49×40
The number of class B students are 53
The arithmetic mean of attendance of Class A is 35%
Arithmetic mean of 53 students attendance of Class A is 53×35
The percentage of arithmetic mean of attendance of class A and B is
= (40×49 + 35×53 )/ (49 + 53)=3815/102
= 37.40