An English professor assigns letter grades on a test according to the following scheme. A: Top 15% of scores B: Scores below the top 15% and above the bottom 55% C: Scores below the top 45% and above the bottom 19% D: Scores below the top 81% and above the bottom 6% F: Bottom 6% of scores Scores on the test are normally distributed with a mean of 74.2 and a standard deviation of 9.6. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessar

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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