If E(X) = 6 and E[(X)(X-1)] = 51,  a) find the second moment  b) find the variance of X Please provide your working and round your answers to 3 decimal places

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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If E(X) = 6 and E[(X)(X-1)] = 51, 

a) find the second moment 

b) find the variance of X

Please provide your working and round your answers to 3 decimal places

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