Dorabella and Guillermo are rowing on the same river in the same direction Dorabella who is rowing her Canoe at 7 mph and it’s exactly 4 miles ahead of Guillermo who is rowing his canoe at 9 mph. how many hours will it take Guillermo to catch Dorabella well?

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?