Noah had 140 to spend on toys. He buys a train, a plane, and a toy car. That means he spent 20 on the train, 30 on the plane, and 10 on the toy car. How much does he have left?

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?