The weekly wages earned by the hundred workers of a factory are set out in the following table:

Calculate the three quantiles of the above distribution, taking n/4, 2n/4, and 3n/4, as their respective ranks.

The following table shows the age distribution of heads of families in a certain country during the year 1957. Find the median, the third quartile and the second decile of the distribution. Check your results by the graphical method:

Weekly Wages (Rs): 12.5-17.5 17.5-22.5 22.5-27.5 27.5-32.5 No. of Workers: 12 16 25 14 32.5-37.5 37.5 42.5 42.5 47.5 47.5-52.5 52.5-57.5 13 1 10 6 3