Question

What is the mean marks of students for the following data ? (Nearest to an integer)
Marks
0 and above
10 and
20 and
30 and
40 and
50 and
above
above
above
above
above
No. of
37
34
29
22
12
0
students

Answer 1

Given:  marks of students

0 and above      37

10 and above     34

20 and above    29  

30 and above    22

40 and above    12  

50 and above     0

To Find : mean marks

Solution:

   

CI                   x              f                        fx

0 - 10            5           37-34 =   3           15

10 - 20          15         34 - 29 = 5           75  

20 - 30         25        29 - 22 = 7          175

30 - 40         35        22 - 12 =  10         350

40 - 50         45       12 -  0  =   12          540

50 - 60         55                       0             0

                                           37              1155

Mean Marks  = 1155/37

≈ 31.22

Nearest to an integer 31

Mean Marks  is 31

Learn More

Arithmetic mean of nine observation is calculated as 38 . But in ...

brainly.in/question/8318092

43 the average income of a group of 50 persons working in a factory ...

brainly.in/question/11635184