The number of students in four classes A, B, C, D and their respective mean marks obtained by each of the class are given below: Class A Class B Class C Class D Number of students 10 40 30 20 Arithmetic mean 20 30 50 15 The combined mean of the marks of four classes together will be:

UGC NET Paper 1 GA 2006 Dec Solved Paper

Question : 35 of 50

Marks: +1, -0

The number of students in four classes A, B, C, D and their respective mean marks obtained by each of the class are given below:

The combined mean of the marks of four classes together will be:

Solution:

Mean of the marks

= {10× 20 +40× 30+ 30× 50 +20 ×15}/{10+40+30+20}

={200+1200+1500+300}/100

=3200/100=32

Go to Question:

Prev Question

Next Question