- CFA Exams
- CFA Level I Exam
- Study Session 3. Quantitative Methods (2)
- Reading 9. Common Probability Distributions
- Subject 8. The Standard Normal Distribution

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**CFA Practice Question**

A bell-shaped, symmetrical frequency distribution has a mean of 45. If 95% of the observations on the variable fall between 30 and 60, the standard deviation of the variable is ______.

A. 5.00

B. 7.50

C. 15.0

**Explanation:**95% of the observations in a bell-shaped, symmetrical frequency distribution lie within approximately 2 standard deviations of the mean. The standard deviation is then (45-30)/2 = 7.50.

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