Center & SpreadHigh School · Statistics & Probability · HSS-ID.A.1, HSS-ID.A.2, HSS-ID.A.3
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High School · Statistics & Probability · Think & learn · Ages 14–18

Center & Spread

Maths standardHSS-ID.A.1HSS-ID.A.2HSS-ID.A.3Use dot plots to find and compare center (mean, median) and spread, and explain the effect of outliers.

  1. Median: the middle value when sorted. Mean: the total ÷ how many.
  2. Outliers drag the mean much more than the median.
  3. Spread: range, IQR or standard deviation.
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