Analysis and calculation questions: u he sieve analysis results of sand is as follows: Sieve size/mm 4.75 2.36 1.18 0.60 0.30 0.15 <0.15 Weight/g 20 65 85 90 110 110 20 Please answer: a) What is the fineness modulus of an aggregate? b) Calculate the fineness modulus of the sand. (During the calculation, the result is expressed as a percentage and an integer is retained. Keep a decimal place in the final result.) c) What kind of sand is the sample? (select form coarse sand, medium sand, or fine sand)