Which pair of angles are consecutive interior angles? < 6 and < 5< 6 and < 4< 1 and < 5< 1 and < 3

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?