If a fuel storage tank is 35 percent full when there are 280 gallons in it how many gallon can be held when the tank is full capacity

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?