The charting of a data set in which most of the data points are concentrated around the average (mean), thus forming a bell-shaped curve.

Question

Options

• APareto Chart
• BNormal Distribution
• CStandard Deviation
• DScatter Diagram

• A
  5% (3)
• B
  86% (50)
• C
  2% (1)
• D
  7% (4)

Explanation

Normal Distribution describes exactly this phenomenon - a dataset where values cluster symmetrically around the mean, producing the characteristic bell-shaped curve, with fewer data points appearing as you move further from the center.

Why the distractors are wrong:

• A. Pareto Chart - a bar chart that ranks causes by frequency/impact (the 80/20 rule); it's not bell-shaped and doesn't describe data distribution around a mean.
• C. Standard Deviation - a numerical measure of how spread out data is from the mean, not a chart type or shape.
• D. Scatter Diagram - plots two variables against each other to show relationships or correlations, not the distribution of a single dataset.

Memory tip: Think "normal = natural" - in nature, most measurements (height, weight, test scores) cluster around the average and taper off at extremes, forming that natural bell shape. If you see "bell curve" on an exam, it's always Normal Distribution.

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