A recent survey asked college students how much time they spend studying each week. The results showed a mean of 10 hours with a standard deviation of 2 hours. Complete parts (a) through (c) below. (a) Find the probability that a randomly selected student would spend less than 7 hours studying per week. A. 0.500 O B. 0.333 O C. 0.067 O D. 0.933 (b) What percent of students spend more than 12 hours studying per week? O A. 84.1% O B. 15.9% O C. 20.0% O D. 80.0% (c) What is the maximum number of hours studying per week that would still place a student in the bottom 10%? O A. 13.1 OB. 7.4 O C. 12.6