On a standardized exam, the scores are normally distributed with a mean of 300 and a standard deviation of 20. Find the z- score of a person who scored 315 on the exam.
On a standardized exam, the scores are normally distributed with a mean of 300 and a standard deviation of 20. Find the z- score of a person who scored 315 on the exam.
On a standardized exam, the scores are normally distributed with a mean of 300 and a standard deviation of 20. Find the z- score of a person who scored 315 on the exam.
Transcribed Image Text:On a standardized exam, the scores are
normally distributed with a mean of 300
and a standard deviation of 20. Find the z-
score of a person who scored 315 on the
exam.
Answer:
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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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