Stop One.com, a large Internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days. Lead Time (days) 0 to under 6 Frequency 6 35 6 to under 12 12 to under 18 28 18 to under 24 15 24 to under 30 Total 2 66 a. How many orders were studied? b. What is the midpoint of the first class? (Round the final answer to 1 decimal place.) c. What are the coordinates of the third class for a frequency polygon assuming we draw a frequency polygon using the midpoints? (Round the final x value to 1 decimal place and y value to whole number.) x= y d. Not available in Connect.