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Math

Mean and covariance matrix calculator

Covariance is a measure of the covariance of two variables (X and Y). The calculator calculates the average for the sample and the covariance between variables. Sets of X and Y must be the same number.      
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Pseudo-random number generator without repetition

Calculator generates random numbers without repetition from 0 to n-1.        
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Roots of a quadratic equation

Calculator based on the entered coefficients calculated roots of a quadratic equation.              
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Building

Insulation of wall

Jak policzyć izolację ścian?
Calculator allows you to calculate the amount of insulation panels needed to cover the walls of the building using the "light wet" or "dry light" methods.