The document provides the frequency distribution of marks awarded to 100 candidates in ranges of 1-10, 11-20, 21-30, 31-40, 41-50. It asks to: 1) Construct a cumulative frequency table representing the distributions. 2) Estimate the lower and upper quartiles to determine the interquartile and semi-quartile ranges. 3) Calculate the probability that a randomly selected candidate's mark is less than or equal to 25.