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- California
- University of California - Berkeley Extension
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- Mathematics X402
- Jurkat
- Module 5.2- Normal Distribution

Christopher W.

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3
Empirical Rule

- W/ normal distribution, data falls in predictable patterns.
- one std dev to left/right of mean- 68% of data
- two std dev to left/right of mean- 95% of data
- three std dev to left/right of mean- 99.7% of data

Normal distribution

- continuous probability distribution
- density curve that is symmetric, bell shaped and unimodal
- mean is equal to the median is equal to the mode of the data
- curve is a practical approximation not an exact representation.

represents the number of standard deviations that observation is above or below the mean

- use Z- score to find the probability of an observation being less than that value on the distribution
- to find the probability of an amount being more than a given value, calculate the complement- one minus the z-score.
- If z-value is POSITIVE, original x-value is to the right of (above) the mean. If NEGATIVE, original x-value is to the left of (below) the mean

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