Normal Distribution: Calculating Probabilities/Areas (z-table)

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Joshua Emmanuel
Published at : 20 Dec 2020
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This tutorial shows how to calculate areas/probabilities using the cumulative standard normal tables.
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Steps for calculating areas/probabilities using the cumulative normal distribution table:
1. Translate the score (x) into a z-score:
2. Find the corresponding area from the z-table.
3. i) For less than area/probability, the area in the table is the answer.
ii) For greater than area, subtract area in the table from 1.
iii) For area between, subtract smaller area from larger area.
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