Find the mean and mode for the following data :
class | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |
frequency | 4 | 8 | 10 | 12 | 10 | 4 | 2 |
class | frequency | x | Fx |
10-20 | 4 | 15 | 60 |
20-30 | 8 | 25 | 200 |
30-40 | 10 | 35 | 350 |
40-50 | 12 | 45 | 540 |
50-60 | 10 | 55 | 550 |
60-70 | 4 | 65 | 260 |
70-80 | 2 | 75 | 150 |
50 | 2110 |
Formula to calculate mean
Mean ,
Formula to calculate mode
Therefore mean is 42.2 and mode is 45