The elevation of Mt. Everest is 29,028 feet. The elevation of the Dead Sea is –485 feet. What equation could you use to solve this problem

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?