Marks |
frequency (f) |
Cumulative frequency (c.f.) |
50-60 |
8 |
8 |
60-70 |
10 |
18 |
70-80 |
12 |
30 |
80-90 |
16 |
46 |
90-100 |
18 |
64 |
100-110 |
14 |
78 |
110-120 |
12 |
90 |
120-130 |
10 |
100 |
N = 100
⇒ Median = \(\frac N2\)th term
Median class = 90-100
Median = \(l + \left(\frac{\frac N2 - c.f.}f\right) \times h\)
\(= 9 + \left(\frac{50 - 46}{18}\right) \times 10\)
\(= 90 + \frac{40}{18}\)
\(= 92.2\)
The median weight of apple is 92.2 gm.