Julio is paid 1.2 times its normal hourly rate for each hour he works over 32 hours in a week. last week he worked 45 hours and earned $656.88.

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?