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Young people, ages 13-24, spend an average of μ = 22.2 hours a week online. Assume the time spent online has a normal distribution with a standard deviation of σ = 6.45 hours a week.

Question:

The amount of time spent on line by what fraction of young people fall within ±10 hours from the population mean?

a. 0.8264

b. 0.8576

c. 0.788

d. 0.9016

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