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Precalculus · S-MD

Normal Distribution Probability Calculations

A bar graph shows numbers as bars. Taller bar = bigger number.

PrecalculusCommon Core HSS-MD.B.5S-MDVerified correct ✓

Worked examples

A normal distribution has mean μ = 94 and standard deviation σ = 5. Find P(X < 89) using the standard normal table. Give your answer as a decimal rounded to 4 decimal places.
Answer: 0.1587
A normal distribution has mean μ = 83 and standard deviation σ = 5. Find P(X < 70.5) using the standard normal table. Give your answer as a decimal rounded to 4 decimal places.
Answer: 0.0062

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Normal Distribution — Properties and z-Scores

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