Jo sold 336 cake at the sale. bop sold 286 cake. bop estimate he sold 50 fewer cake than jo. how did he estimate

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?