school is given below. The frequency of students obtaining marks between 31 - 40 is
22. Frequency distribution of marks obtained in an examination by students in a
unknown. If the weighted mean of the marks obtained is 42-85, then find the number of
students obtaining marks between 31 - 40.
Interval of obtained marks
11-20
21 - 30
31-40
41-50
51 - 60
61 - 70
71 - 80
No.of students (frequency)
42
38
f
84
48
36
32
please help me to solve this!!!
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