short and quick answer, please, i do not have much time

1. a) State the mean and variance for the distribution shown in Figure 1 below. Hint: vertical lines are 1 standard deviation apart. Figure 1 (2 marks) b) USIM's students spend an average of 18.3 hours a week for online classes. If 95% of students spend between 13.1 and 23.5 hours a week, compute the probability that a randomly selected student spend less than 15 hours a week for online classes. (5 marks) c) It has been reported that last semester, 25% of students have fallen asleep dur- ing the online classes. If 200 students are selected at random, show the prob- ability that 62 will say that they have fallen asleep during the online classess is 0.94. (8 marks)