Cafeteria workers want to know the students favorite lunch served in the cafeteria. All of the students are lined up and every sixth student is surveyed. Is this same biased or unbiased? A. Biased
B. Unbiased

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?