TI-84 Plus Faq
TI-84 Plus is one of the best graphing calculators on the market today.
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How to find standard deviation on TI-84 plus?
In statistics, the standard deviation (SD, also represented by the lower case Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation indicates that the data points tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.
How to program quadratic formula in TI-84 Plus