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# Probability based on exponential distribution

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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 .15 hour (9 minutes) per day using a computer for leisure. Individuals ages 15 to 19 spend 1.0 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 8 minutes per day using a computer for leisure. (Round your answers to 4 decimal places.)

Proportion _____ and _____

Proportion ____ and ____

Between 16 minutes and 48 minutes using a computer for leisure
Proportio ____ and ____

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 age 75 and over minutes
Amount of time for individuals ages 15 to 19 minutes