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What about finding variance?

For Normal distribution there are no fixed parameters! It depends upon the possilbe values. Weight may be from 55 to 70. Mean can be taken as 65. I dont know how to find the variance in this question. May be it's npq. I am not sure about that !

I did not get ur question. I never learned that stuff!

I am targeting that score although expecting 42+

Confused! Can anybody help me in permutation and combination chapter. Post some useful notes and tips...all i want is to get is 47+ in stats to keep my hopes for an A