Question: Suppose collection of all quiz marks of a class of students is normally distributed with a mean of 7 and a standard deviation of 1.

Suppose collection of all quiz marks of a class of students is normally distributed with a mean of 7 and a standard deviation of 1. Sketch the normal curve with the shaded area and corresponding endpoints (values on the horizontal axis) to show the middle 95% of the marks (hints: use empirical rule or 68%-95%-99.7% rule)

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