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obability-1.pdf - Adobe Acrobat Pro DC View Sign Window Help Tools Ch 6 Probability-1... x T 2 135% 7. A report in 2010 indicated that American between the ages of 8 and 18 spend an average of u = 7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets. Assume that the distribution of times is normal with a standard deviation of o= 2.5 hours and find the following values. a. What is the probability of selecting ab individual who used electronic devices more than 12 hours a day? b. What proportion of 8- to 18 years old American spend between 5 and 10 hours per day using electronic devices? In symbols , p(5