The Bureau of Labor Statistics’ American Time Use Survey showed that the

1. 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 .40 hour (24 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 a day using a computer for leisure. (Round answer to 4 decimal places) Proportion 0.5654and 0.2425 b. More than 2 hours. (Round answer to 4 decimal places) Proportion 0.0067 and 0.1889 c. Between 20 and 140 minutes using the computer for leisure. (Round answer to 4 decimal places) Proportion 0.4317and 0.6144 d. Find the 24th percentile. Seventy six percent spend than what amount of time? (Round to 2 decimals) Amount of time for individuals age 75 and over in minutes =6.59 Amount of time for individuals ages 15 to 19 =19.76

2. The mean of a normal distribution probability is 400 pounds. The standard deviation is 10.  a. What is the area between 415 pounds and the mean of 400 pounds? (Round to 4 decimals) b. What is the probability of selecting a value at random and discovering that it has a value less than 395 pounds. (Round to 4 decimals)

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