13. The table below shows the distribution of marks for 100 students on a science test.(a) (i) State the median class.(ii) Obtain an estimate for the mean mark on the test.(iii) Calculate the...

13. The table below shows the distribution of marks for 100 students on a science test.(a) (i) State the median class.(ii) Obtain an estimate for the mean mark on the test.(iii) Calculate the probability that a student chosen at random scoredbetween 31 and 60, both scores inclusive.(b) Using graph paper and a scale of 1 cm for 10 marks on the x-axis and 1 cmfor 2 students on the y-axis, draw a frequency polygon to represent theinformation in the table.