Question

find mean.
(b) Marks obtained by 40 students in an exam are give
below
Marks
25 30 15 20 24
Number of Students
4
8 | 12 10 | 6​

Answer 1

Step-by-step explanation:

Here

Marks. | No. of

scored. | students

by. |

them. |

(x) (f)

25. - 4

30. - 8

15 - 12

20. - 10

24. - 6

mean =Sigma( fi*xi/fi)

= 25*4+30*8+15*12+20*10+24*6/4+8+12+10+6

= 100+240+180+200+144/40

= 864/40

= 216/10

= 21.6

So Mean marks = 21.6

hope it helps ✌