find the median:
with solution


class interval
35-39
30-34
25-29
20-24
15-19
10-14
i=5
frequency (f)
4
7
12
10
5
2
N=40
lower boundary (LB)
34.5
29.5
24.5
19.5
14.5
9.5
<cf
40
36
29
17
7
2



with solution po​