The mean of the following data is 38.2. Find the missing frequencies f1 and f2 if the total frequency is 50.
Classes | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |
Frequency | 4 | 4 | F1 | 10 | F2 | 8 | 5 |