Kim had 30 minutes to do a three-problem quiz. She spent 8 9/10 minutes on question A and 4 3/5 minutes on question B. How much time did she have left for question C?

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?