he was a big man , a very fat man ,
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Pattern recognition
sigma is the short for sums for example, lets say you want to add 1+2+3+4+5+6.................+99+100 it's a problem writing every single term, right? so if the sum it's a pattern like the example above, you can write it in sigma notation search it up on the internet and find some simple examples because i am not the best explainer in the world =) **Sigma is also used in statistics to mean "standard deviation."
The exponential notation and standard notation for 2x2x2x2x2 is:2532
z = (x-mu)/sigma So x = sigma*z + mu = 3m*(-3) + 25 = -9m + 25
Let x denote the values of the variable in question. Suppose there are n observations. Let Sx = the sum of all the values. then the mean of x, Mx = Sx/n Let Sxx = the sum of all the squares of the values. The Vx (= the variance of x) is Sxx - (Mx)^2 and sigma(x) = sqrt(Vx). Therefore one sigma deviation, relative to the mean, = Mx - sigma(x), Mx + sigma(x).