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Question 150 / 5 pointsA statistics class at Wilmington College has 25 students of which 15 are math majors and 10 are business majors. The professor randomly selects five students to work together on a group project. What is the probability that less than three of the students in this group are business majors?0.25610.3447
0.69880.7582Question 165 / 5 pointsThe ________ of a discrete probability distribution measures the dispersion of each outcome of the random variable from the mean of the distribution.Question 175 / 5 pointsAssume that the number of customers who arrive at a water ice stand follows the Poisson distribution with an average rate of 6.4 per 30 minutes. What is the probability that more than one customer will arrive during the next 30 minutes?Question 185 / 5 points"No shows" are the people with reservations who fail to arrive. The following table shows the numberof no shows each day at a hotel over the last 125 business days.Number of No ShowsFrequency06113521031247
What is the mean number of no shows per day?Question 190 / 5 pointsA novel on the Amazon.com web site has the following ratings, in number of stars, from reviewers:Number of StarsFrequency122931241859What is the standard deviation of this distribution?1.102.563.194.60Question 205 / 5 pointsThe following table shows the number of pieces of junk mail that arrives in my mailbox each day.Number of Pieces of Junk MailFrequency26310412510
62What is the standard deviation for the number of pieces of junk mail received per day?