Note: Focus is on explanations, not on numeric results! 21. The time spent online with the smartphone per week by 16 yea

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Note Focus Is On Explanations Not On Numeric Results 21 The Time Spent Online With The Smartphone Per Week By 16 Yea 1 (50.54 KiB) Viewed 36 times

Note: Focus is on explanations, not on numeric results! 21. The time spent online with the smartphone per week by 16 year old stu- dents has a normal distribution with mean 32.5 hours and standard devia- tion of 5.5 hours. What percentage of 16 year old students are online for... (a) ... more than 29 hours per week? (b) ... less than 38 hours per week? (c) ... between 30 and 35 hours per week? Try to find out using a z-table (this requires rounding your z-values).