Two balls are drawn, without replacement, from a bag containing 15 red balls numbered 1−15 and 6 white balls numbered 16−21. (Enter your probabilities as fractions.) (a) What is the probability that the second ball is red, given that the first ball is white?

(b) What is the probability that both balls are even-numbered?

(c) What is the probability that the first ball is red and even-numbered and the second ball is even-numbered?

The thickness of photoresist applied to wafers in semiconductor manufacturing at a particular location on the wafer is uniformly distributed between 0.2070 and 0.2171 micrometers.(a) determine the proportion of wafers that exceeds 0.2125 micrometers of photoresist thickness. (round your answer to 3 decimal places.)enter your answer in accordance to the item a) of the question statement(b) determine the mean of x. (round your answer to 4 decimal places.)enter your answer in accordance to the item b) of the question statement micrometers(c) determine the variance of x. (round your answer to 8 decimal places.)enter your answer in accordance to the item c) of the question statement micrometers2