Class : | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 |
---|---|---|---|---|---|
Frequency : | $$\alpha $$ | 110 | 54 | 30 | $$\beta $$ |
Class : | 0 $$ - $$ 6 | 6 $$ - $$ 12 | 12 $$ - $$ 18 | 18 $$ - $$ 24 | 24 $$ - $$ 30 |
---|---|---|---|---|---|
Frequency : | a | b | 12 | 9 | 5 |
Class | Frequency | $${x_i}$$ | $${f_i}{x_i}$$ |
---|---|---|---|
0-6 | a | 3 | 3a |
6-12 | b | 9 | 9b |
12-18 | 12 | 15 | 180 |
18-24 | 9 | 21 | 189 |
24-30 | 5 | 27 | 135 |
$$N = (26 + a + b)$$ | $$(504 + 3a + 9b)$$ |