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Mathematics, 13.01.2021 05:40 patrickwilson

Kaitlin's survey of 850 high school students asked how many hours per day they spent using social media. The mean was xbar=3.67 hours and the standard deviation was 1.19 hours. a) What percentage of surveyed students used social media services between 3 and 4 hours per day?;
b) How many hours per day did students in the 75th percentile use social media services?

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