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The median of a normal variate x with probablity dessity function

 f(x) = 1/(sigma*root(2*pi)*exp[-{(x-u)^2}/(2*sigma^2)] = ?

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Can any one say how to solve Z score questions like below1) P(1≤Z≤30) = ?2) P(z>2.5)=?3) P(z<=k) = 0.9 find k?Will they give any related values of Z-scores in exam ?