1. 
You and your classmates build little rubber band powered vehicles designed to pull a small box of 200 grams across the carpeted floor of your classrooms. On the final demonstration day, each car is wound up (30 revolutions) and allowed to pull the load. The distance pulled is measured. Here are the results, in order (in cm), for the 16 people that were there that day {14, 53, 12, 9, 8, 46, 47, 37, 27, 19, 55, 38, 30, 42, 44, 52}. Calculate (a) the mode, (b) the median, (c) the mean, and (d) the range of the distance data. Round all answers, except medium, to the nearest integer.


2. 
Kylie rode her bike around the hike and bike trail for half an hour and averaged 16 miles per hour. Victoria rode her bike around the trail and traveled 14 miles in 26 minutes. What was the difference in their average speeds? Round your answer to the nearest tenth.


3. 
Ryan built a compound machine designed to lift a 1kilogram load. He tested the machine several times using a can of sand as the load and a can of sand for the input force. He added sand to the input can until the machine lifted the load. After running the machine three times he calculates an average efficiency of 70%. If two of his calculations were 68% and 74%, what was his third calculation?


4. 
Professor Bloop allowed a toy car to roll down an inclined plane several times. The plane has an elevation of 10 cm and the length of the incline was 22 cm. The first time he let the car go down the incline it took 3.3 seconds. The second time it took 3 seconds. He then added a little lubricant to the wheel axles and the time was reduced to 2.9 seconds. What was the average speed in meters per second of the car's trip down the incline?

