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2. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   An electronic pocket calculator with a seven-segment liquid-crystal display (LCD) that can perform arithmetic operations. A modern scientific calculator with an LCD. An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics .

3. Algorithms for calculating variance - Wikipedia

   en.wikipedia.org/wiki/Algorithms_for_calculating...

   Therefore, a naïve algorithm to calculate the estimated variance is given by the following: Let n ← 0, Sum ← 0, SumSq ← 0. For each datum x : n ← n + 1. Sum ← Sum + x. SumSq ← SumSq + x × x. Var = (SumSq − (Sum × Sum) / n) / (n − 1) This algorithm can easily be adapted to compute the variance of a finite population: simply ...

4. Standard deviation - Wikipedia

   en.wikipedia.org/wiki/Standard_deviation

   The mean and the standard deviation of a set of data are descriptive statistics usually reported together. In a certain sense, the standard deviation is a "natural" measure of statistical dispersion if the center of the data is measured about the mean. This is because the standard deviation from the mean is smaller than from any other point.

5. These Calculators Make Quick Work of Standard Math ... - AOL

   www.aol.com/best-calculators-students...

   At just 6.1 ounces, it’s nice and lightweight, and the white color is an attractive aesthetic alternative to standard black calculators. For less than $20, it’s a great value, as well.

6. Scientific calculator - Wikipedia

   en.wikipedia.org/wiki/Scientific_calculator

   A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic ( addition, subtraction, multiplication, division) and complex ( trigonometric, hyperbolic, etc.) mathematical operations and functions. They have completely replaced slide rules as well as books of mathematical tables ...

7. Standard normal table - Wikipedia

   en.wikipedia.org/wiki/Standard_normal_table

   Standard normal table. In statistics, a standard normal table, also called the unit normal table or Z table, [1] is a mathematical table for the values of Φ, the cumulative distribution function of the normal distribution. It is used to find the probability that a statistic is observed below, above, or between values on the standard normal ...