Seventy percent of the bicycles sold by a certain store are mountain bikes. Among 100 randomly selected bike purchases, find the probabilities below. (Use the approximationg normal distribution. You may need to use a table. Round your answers to four decimal places.) LA USE SALT (a) What is the approximate probability that at most 80 are mountain bikes? (Hint: See Example 6.33.) 14 X (b) What is the approximate probability that between 60 and 80 (inclusive) are mountain bikes? 2 X (c) What is the approximate probability that more than 85 are mountain bikes? 3 X (d) What is the approximate probability that at most 30 are not mountain bikes? 4 X