binomcdf probabilit normalc nvNorm Hours per week: 4 10 gives are 4. 400 college students were asked how many hours per week they spend studying. A sample of Some of the results are given in the following table: 20 Z-score: -2.5 -1 -0.5 Formula Percentile Rank: 20 24 7534 1 10 25 35 40 5-5 36 aer aevi wolna 50 75 By inspection of the table, determine: a) The mean hours per week for all 400 students b) The median hours per week for all 400 students 000 a gi c) The study hours representing the third quartile d) The percent of all 400 students that are at or below 20 study hours : e) Did you enjoy the statistics class (yes or no )