Incomes of employees in an industrial concern are given below. The total income of the 10
employees in the class over $ 2500 is $ 30,000.
Income ($) Frequency
Below 500 90
500-1000 150
1000-1500 100
1500-2000 80
2000-2500 70
2500 and over 10
(a) Compute the arithmetic mean income.
(b) Every employee belonging to the top 25% of the earners is required to pay 5% of his/her
income to the workers’ relief fund. Estimate the contribution to this fund.