¿Cómo funciona las maquinas?

In a compound condition, both conditions on either side of the logical operator and must be true for the overall condition to be true. a: true b: false

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.

Which statistical function in a spreadsheet you to see how far each number varies, on average, from the average value of the list?