The cumulative distribution below shows the weekly wages of 50 workers in a factory.
(a) Wages less than (Rs) : 400 | 600 | 800 | 1000 | 1200
Cumulative frequency : 12 | 25 | 37 | 45 | 50
(b) (i) Convert the above data into a simple (class–wise) frequency distribution using equal class width.
(c) (ii) Using your table, calculate the mean weekly wage of the workers.