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 0.35 hour (21 minutes) per day using a computer for leisure. Individuals ages 15 to 19 spend 1.2 hour per day using a computer for leisure. If these times follow an exponential distribution, find the proportion of each group that spends:
a.) Less than 20 minutes per day using a computer for leisure. (Round your answers to 4 decimal places.)
b.) More than two hours. (Round your answers to 4 decimal places.)
c.) Between 40 minutes and 120 minutes using a computer for leisure. (Round your answers to 4 decimal places.)
d.) Find the 26th percentile. seventy four percent spend more than what amount of time? (Round your answers to 2 decimal places.)