Liz flips a coin 80 times. The coin lands heads up 32 times and tails up 48 times. the theoretical probability of the coin landing heads up is

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?