Cedric buys songs at a store that charges $1.20 per song. shumeka buys songs at a different store. the table shown here gives the cost when she buys 6, 7, and 8 songs.

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?