Two runners are to race one lap on a circular track. The radius to the inside lane is 50m. The radius to the outside lane is 51m. How much of a head start should the runner on the outside get? (use 3.14 for )
151 m
50 m

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)