Rico purchased an annual membership to the gym. The average monthly price (p) for his membership for a 12-month period is p=45m+6012, where m is the number of months.

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?