This is 7th grade math and answer asap. tell me which answer choice in q.5. i will gave brainliest, thx, and 5 star if answered right.

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?