The chorus at eastside high school is holding a fund-raiser. the goal is to raise $500. the graph shows the number of short sleeve and long sleeve t-shirts the chorus needs to sell in order to raise $500.

if they sold only short sleeve t-shirts and raised exactly $500, how many shirts did they sell?
a) 15
b) 20
c) 25
d) 50

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.)