Suppose you have 40 minutes to exercise at the gym and you want to use the stair machine and the stationary bike. how many minutes should you spend on each machine so that you burn 225 calories? stair machine: 5 cal/min stationary bike: 6 cal/min

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?