MATH-M 118 Exam Solutions Fall 2018: 5,6,7,8, Ihop, European Route E20

2. Imelda has 5 pairs of shoes. Four of them are worth $30 each, while the fifth is worth $2000. She selects a pair at random to walk to the midterm examination. What is the expected value of the pair selected? (a) $424 (b) $30 (c) $50.20 (d) $432 (e) $1030 (f) none of the above

1. Professor Schrödinger has 4 white cats and 6 grey cats. He selects two cats at random for his famous experiment. What is the probability that the two selected cats are of the same color? (a) 8/15 (b) 1/3 (c) 1/2 (d) 7/15 (e) 24/15 (f) none of the above

3. A box contains 8 green and 4 blue marbles. Two marbles are selected at once with no replacement). Find the expected number of green marbles among the selected ones. (a) 1 (b) 1/3 (c) 2/3 (d) 1/2 (e) 4/3 (f) none of the above