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Exercise 7-39 (LO7-5) The Bureau of Labor Statistics’ American Time Use Survey showed that the amount...

Exercise 7-39 (LO7-5)

The Bureau of Labor Statistics’ American Time Use Survey showed that the amount of time spent using a computer for leisure varied greatly by age. Individuals age 75 and over averaged 0.30 hour (18 minutes) per day using a computer for leisure. Individuals ages 15 to 19 spend 0.9 hour per day using a computer for leisure. If these times follow an exponential distribution, find the proportion of each group that spends:

Less than 17 minutes per day using a computer for leisure. (Round your answers to 4 decimal places.)

  

   Proportion

Age 75 and over   0.0013

Ages 15 to 19   0.0821

   sheet is drawn here                       b   More than 2 hours. (Round your answers to 4 decimal places.)  

  

   Proportion

Age 75 and over   0.0013

Ages 15 to 19   0.1821

   sheet is drawn here                       c   Between 34 minutes and 102 minutes using a computer for leisure. (Round your answers to 4 decimal places.)  

  

   Proportion

Age 75 and over  

Ages 15 to 19  

   sheet is drawn here                       d   Find the 30th percentile. Seventy percent spend more than what amount of time? (Round your answers to 2 decimal places.)  

  

      

Amount of time for individuals ages 75 and over       minutes

Amount of time for individuals ages 15 to 19       minutes

sheet is drawn here                  

math   Statistics-And-Probability   
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Answer #1

a) Less than 17 minutes per day using a computer for leisure. Age 75 and over: 1-1,小,»-1-0.388897 = 06111 -1-1-0.388897 0.6111 Ages 15 to 19:1-e 3-, = 1-e(78y -1-e-021794-1-0.80417 = 0.1958 b) More than two hours. Age 75 and over: 1-e㈱n-1---1-000127259=0.9987 1-e(R )12.1-e(รื่)120-1-e-1.53846- Ages 15 to 19: 1-0.21471=0.7853

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