4. If two resistances R1 and R2 are connected in parallel, then the resultant resistance is
A)R1+R2
B)R1-R2
C)R1R2 by R1+R2
D) R1+R2 by R1R2

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.)