A pair of number cubes is rolled 174 times. The table shows the results of the sums. Find the theoretical and experimental probability of getting two numbers whose sum is 10. The theoretical probability of getting two numbers whose sum is _?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?