Please give me answers
9. From the following data, calculate coefficient of quartile deviation. Also, find the range of wages of middle 50% of the workers :
Wages less than | 10 | 20 | 30 | 40 | 50 | 60 | 70 |
No. of Workers | 5 | 8 | 15 | 20 | 30 | 33 | 35 |