From among the choices below, choose the description that BEST represents the set of numbers graph on the number line: A.) all negative real numbers B.) all real numbers except for zero C.) all positive real numbers D.) all negative integers

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?