Develop an equation. Sally's savings account has $238 and she is withdrawing (taking money out) $17 each week to put gas in her car

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?