The cell phone store is having a new years sale! you can save 20%on the iphone. if the phone usually costs $300 how, much will it cost today?

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?