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Khan Academy on a Stick
ck12.org normal distribution problems: z-score
Z-score practice
Normal distribution
Introduction to the normal distribution
Normal distribution excel exercise
ck12.org normal distribution problems: Qualitative sense of normal distributions
ck12.org normal distribution problems: Empirical rule
ck12.org normal distribution problems: z-score
ck12.org exercise: Standard normal distribution and the empirical rule
ck12.org: More empirical rule and z-score practice
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