A lot of 50 spacing washers contains 30 washers that are thicker than the target dimension. Washers are selected from the lot at random without replacement. (a) What is the minimum number of washers that need to be selected so that the probability that all the washers are thinner than the target is less than 0.10? Enter your answer in accordance to the item a) of the question statement (b) What is the minimum number of washers that need to be selected so that the probability that 1 or more washers are thicker than the target is at least 0.90?