1. Explain why the above table is a validprobabilitydistribution.

1. Determine the probability a randomly selected student learns at campus three times per week.

1. Find the probability a randomly selected student learns at campus at least three times per week.

1. Calculate the expected number of days per week students learnoncampus.

1. By considering the table above, determine the variance of the above probability distribution. Write your answer correct to 4decimal places.

1. Hence, find the standard deviation of the above probabilitydistribution.

Write your answer correct to 3decimalplaces.