Expectation Value of Nsub.1 for Rare Species: What is <N> & DeltaN?

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SUMMARY

The discussion centers on the expectation value and the variance deltaN for the number of hairs Nsub.1 on a rare species, where Nsub.1 can only take values of 2l (l=0,1,2,...). The probability of finding an animal with 2l hairs is given by exp(-1/l!). The user has solved the mathematical problem but seeks guidance on grading the concept and understanding tensors in a more accessible manner.

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the number of hairs Nsub.1 on a certain rare species can only be the number 2sup.l(l=0,1,2...) The probability of finding such an animal with 2sup.l hairs is exp-1/l ! what is the expectation,<N>? what is deltaN?
 
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i have solved that question but could anybody please tell me some thing about how to grade the concept and some thing about tensor in more easy way
 

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