- CFA Exams
- 2021 CFA Level I Exam
- Study Session 2. Quantitative Methods (1)
- Reading 7. Statistical Concepts and Market Returns
- Subject 3. Frequency Distributions

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**CFA Practice Question**

A researcher has decided to create a frequency distribution using the following classes:

II. open-ended classes

III. equal class intervals

30-45, 45-60, 60-75, 76 & over

The selection of this set involves which of the following?

I. non-overlapping classes

II. open-ended classes

III. equal class intervals

Correct Answer: II

Note that "76 & over" is an open-ended class. Also, the classes are overlapping (e.g., the classes "30-45" and "45-60" have the point "45" in common).

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**User Contributed Comments**
3

User |
Comment |
---|---|

viannie |
can't be of equal class because of 76 & over |

mjwoulf |
If one open ended class = correct, why with 3 equal class intervals = incorrect? |

jzty |
The class interval for 76 & over is different from any other interval. |