A report in 2010 indicates that Americans between the ages of 8 and 18 spend an average of µ = 7.5 ours 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 σ = 2.5 hours and find the following values: a. What is the probability of selecting an individual who uses electronic devices more than 12 hours a day? b. What proportion of 8 to 18 year-old Americans spend between 5 and 10 hours per day using electronic devices. In symbols it would look like this except the less than symbol SHOULD NOT HAVE THE UNDERLINE MAKING IT LESS THAN OR EQUAL TO (couldn’t edit the document to get rid of the line underneath, so the symbol version should just say p(5 less than X less than 1) (ie., p(5 ≤ X≤ 10 = ?)
A report in 2010 indicates that Americans between the ages of 8 and 18 spend an average of µ = 7.5 ours 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 σ = 2.5 hours and find the following values:
a. What is the probability of selecting an individual who uses electronic devices more than 12 hours a day?
b. What proportion of 8 to 18 year-old Americans spend between 5 and 10 hours per day using electronic devices. In symbols it would look like this except the less than symbol SHOULD NOT HAVE THE UNDERLINE MAKING IT LESS THAN OR EQUAL TO (couldn’t edit the document to get rid of the line underneath, so the symbol version should just say p(5 less than X less than 1) (ie., p(5 ≤ X≤ 10 = ?)
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