60% of candidates who took a job assessment test studied stats. The distribution of their grades is approximately normal with mean 80 marks and standard deviation 5 marks. The probability is 0.15 that a candidate selected at random from those who had never studied statistics will have a grade higher than 84 marks. A). For a candidate selected at random from the candidates with a statistics background, what's the probability that the candidate will have a grade higher than 84% B). For a candidate selected at random from all the candidates, what is the probability the candidate will have a grade higher than 84% C). Given that a candidate selected at random from all The candidates has a grade higher than 84%, what is the probability that the candidate studied stats