Question

Find the mean of marks obtained by 20 students in a class test (out of 50). 25, 40, 15, 16, 28, 39, 41, 22, 28, 30, 36, 40, 30, 18, 22, 32, 48, 32, 38, 40.

• A. 30
• B. 31
• C. 32
• D. 33

Answer 1

The correct option is B 31

Marks obtained by 20 students are :

25,40,15,16,28,39,41,22,28,30,36,40,30,18,22,32,48,32,38,40.

$\therefore Mean,\overline{x}=\frac{25+40+15+16+28+39+41+22+28+30+36+40+30+18+22+32+48+32+38+40}{20}$

=31. (Out of 50)