Question 2 From a stockpile including ROM coal with 43% ash content and particle size (d80) of 5cm, it is required to take representative samples with 99% confidence level and ash tolerance of 1%. Please determine the minimum amount of sample to represent the whole stockpile. (Make your own assumptions when required). Question 3 Based on the given data, please the classification performance of H'Cyclone and discuss the possible problems that can occur and solutions? Representative pulp samples from feed, O'Flow and U'Flow were taken using Marcy cup (1000 ml) and Marcy cup measurements were given below. Feed: 1125 grams (Net pulp weight) O'Flow: 1059 grams (Net pulp weight) U'Flow: 1453 grams (Net pulp weight)