Story Elena and Lin plan to sell a service at market day. Elena is making signs and will be charging her customers a $3 fee plus $0.50 per letter. Lin is making t-shirts and will be charging a $5 fee and $0.25 per letter. At what number of letters does Elena's service become more expensive?

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.)