The following table gives the distribution of monthly income of 600 families in a certain city: Monthly Income (3) No of Families Below 75 60 75-150 170 150-225 200 225-300 60 300-375 50 375-450 40 450 & over 20 () Compute the median income and obtain the limits of income of central 50% of the observed frequency (ii) If a tax is to be collected from those families having income exceeding 350 what percentage of families will be asked to pay tax