A All angles are acute and measure 60°. B One angle is a right angle that measures 90°. C One angle is an obtuse angle that measures more than 90°. D The sum of the three angles equals more than a straight angle. YOU WILL EARN 20 POINTS IT U ANSWER

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?