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Standard Deviation

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025

Definition

Standard deviation describes how spread out values are from the mean.

Course connection

PSAT Math

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Standard Deviation cheat sheet for homework

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5 Must Know Facts For Your Next Test

  1. Standard Deviation appears across 1 PSAT guide as a remediation concept.
  2. Bigger standard deviation means the data are more spread out.

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Standard Deviation Definition for PSAT | Fiveable