Tom runs 3/4 of an hour every monday, 30 minutes every tuesday, half an hour every wednesday, 1 1/4 hours every thursday and 2/3 of an hour on friday. how many hours does tom run from monday to friday?

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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?