Normal Distribution

Question 1

Amounts of data lying within parts of normal distribution

Answer 1

50% on either side of the mean
68% within 1 standard deviation of the mean
95% in two
99.7% in three

Question 2

Properties of normal distribution

Answer 2

• has parameters μ, the population mean, and σ2, the population variance
• is symmetrical (mean = median = mode)
• has a bell-shaped curve with asymptotes at each end
• has total area under the curve equal to 1
• has points of inflection at μ + σ and μ – σ

Question 3

When to use a normal distribution

Answer 3

Large amount of data
Continuous