Question 955924: A survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Find the probability that the hours spent on the home computer by the participant are between 5.5 and 9.5 hours per week.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Find the probability that the hours spent on the home computer by the participant are between 5.5 and 9.5 hours per week.
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z(5.5) = (5.5-8)/1 = -2.5
z(9.5) = (9.5-8)/1 = 1.5
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P(5.5< x < 9.5) = P(-2.5< z < 1.5) = normalcdf(-2.5,1.5) = 0.2417
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cheers,
Stan H.
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