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Example 6.9 from Statistics, 6.2 Using the Normal Distribution
(part 2)
b. Find the maximum number of hours per day that the bottom quartile of households uses a personal computer for entertainment.
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
b. To find the maximum number of hours per day that the bottom quartile of households uses a personal computer for entertainment, find the 25th percentile, k, where P(x < k) = 0.25.
Figure 6.8invNorm(0.25,2,0.5) = 1.66
We use invNorm because we are looking for the k-value.
The maximum number of hours per day that the bottom quartile of households uses a personal computer for entertainment is 1.66 hours.
How did it go?