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in this video we study moments central moments that is moment about the X bar raw moment is denoted by mu R dash that is moment about any value a relation between the central moment and the raw moment also what is skewness and kurtosis so we study the prerequisites of all above topics first of all we study central moment so formula for center moment that is moment about a mean X bar there are two formulates mu R is equal to summation of X I minus X bar raised to R upon N or summation of a Phi in bracket X I minus X bar R raise to R upon summation of I depending upon the data we use this to formula a remark is mu 2 is equal to Sigma square means Sigma square is variance therefore variance is equal to mu-2 as we know that square root of a variance is nothing but a standard deviation so we get the standard deviation is equal to square root of mu 2 now we study the formula of raw moment that is moment about any value a raw moment mu R dash is equal to summation of X I minus a raise to R up