If a and b are two integers, then 3(a - b)' means (A) three times the square of their difference
(B) three times the difference of their squares
(C) six times their difference
(D)
the square of three times their difference

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.)