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Chapter 9

# MATH 123 Chapter Notes - Chapter 9: Standard Deviation, Central Tendency, Binomial Distribution

by OC1682449

School

McGill UniversityDepartment

Mathematics and StatisticsCourse Code

MATH 123Professor

Sidney TrudeauChapter

9This

**preview**shows half of the first page. to view the full**3 pages of the document.**MATH 123 – Linear Algebra and Probability

Chapter 9: Statistics

Frequency Distributions; Measures of Central Tendency

Measures of central tendency:

1. Mean;

2. Median;

3. Mode.

The mean of 𝑛 numbers can be given by:

𝑥̅=∑𝑥

𝑛

The mean of a grouped distribution can be given by:

𝑥̅̅=∑𝑥𝑓

𝑛

Measures of Variation

We can determine how much the numbers in a sample vary from the mean of a distribution by

calculating the variance and standard deviation.

The variance of a sample of 𝑛 numbers can be given by:

𝑠2=∑𝑥2−𝑛𝑥̅2

𝑛−1

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