4. The following are the number of hours travelled by a senior high school student to go to school every day: .5 .25 1.4 1.5 .85 .20 1.5 1.75 .10 .65 .75 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?

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