What is the probability of rolling a number less than or equal to 4 on a six-sided die and then rolling a 5 or 6 on the same die? "Make sure to simplify your answer"
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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?