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How to correctly apply the formulas

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Looked in the textbook and having a hard time understanding how to correctly apply the formulas to this type of question. Textbook examples reads as the following.

Television viewing reached a new high when the global information and measurement company reported a mean daily viewing time of 8.35 hours per household. Use a normal probability distribution with a standard deviation of  2.5 hours to answer the following questions about daily television viewing per household.

a. What is the probability that a household views television between 6 and 10 hours a day (to 4 decimals)?

b. How many hours of television viewing must a household have in order to be in the top 8% of all television viewing households (to 2 decimals)?

c. What is the probability that a household views television more than 4 hours a day (to 4 decimals)?

Reference no: EM131996956

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