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Example 6.8 from Statistics, 6.2 Using the Normal Distribution
d. Find the 70th percentile, —that is, find the score k such that 70 percent of scores are below k and 30 percent of the scores are above k.
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.
d. Find the 70th percentile.
Draw a new graph and label it appropriately. k = 65.6
The 70th percentile is 65.6. This means that 70 percent of the test scores fall at or below 65.5 and 30 percent fall at or above.
invNorm(0.70,63,5) = 65.6
How did it go?