The construction costs (N'000s) and selling prices (N'000s) of new houses in the Coal City were as follows in 1988:
Cost/House Selling Price Number of Houses
30 - 40 45 - 55 181
41 - 51 56 - 66 326
52 - 62 67 - 77 300
63 - 73 78 - 88 175
(a) Find the median cost of houses at Coal City in 1988
(b) Find the modal selling price of houses at Coal City in 1988