Normal Probability Table

• Normal Probability Distribution

  • is a symmetrical, bell-shaped distribution of probabilities.
• Properties of a Normal Curve:

  1. Bell-shaped.
  2. Symmetrical at the center of the graph.
  3. The central tendency, mean, median, and mode meet at the center. They are equal.
  4. The width of the curve depends on the standard deviation.
  5. Tails are flattened out indefinitely and are asymptotic to the baseline.
  6. Area under the curve is equal to 1.
• Factors Affecting the Normal Curve:

  • Mean - determines the center of the normal curve. A change in the value of the mean shifts the graph of the normal curve to the right or left.
  • Standard Deviation - determines the height and width of the curve.
• The Empirical Rule

  • pertains to the area of the curve per standard deviation.
  • the 68-96-99.7 rule.
• Empirical Rule

  A) 34.13

  B) 34.13

  C) 13.59

  D) 13,59

  E) 2.15

  F) 2.15