.5 .25 1.4 1.5 .85 .20 1.5 1.75 .10 .65 .75 2 1 1.10 1.65 1.4 .6 .35 .40 .25 a. What is the mean number of hours spent by the students? variance? standard deviation? b. What is the z-score of size .5 hrs.? C. How many percent of students have a number of hours spent between .5 to 1 hr.? Show the areas in the normal curve. d. What is the percentile rank of a student who travels .75 hrs.?

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