An English professor assigns letter grades on a test according to the following scheme. A: Top 7% of scores B: Scores below the
top 7% and above the bottom 59% C: Scores below the top 41% and above the bottom 18% D: Scores below the top 82% and above the bottom 8% F: Bottom 8% of scores Scores on the test are normally distributed with a mean of 75.7 and a standard deviation of 8.8. Find the numerical limits for a C grade. Round your answers to the nearest whole number, if necessary.
1 answer:
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Jerome rewrote the logarithms as
which eliminates C and D.
Solve the equation:
is undefined for any base
(where the logarithm is real-valued), so we omit that solution.
This makes B the answer.