During a dull football game,1/4 spectators were left after 1 hour. during the next hour 20,000 spectators left. there were 1/12 of the original number of spectators still watching the game. how many spectators were originally present.

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?