7 The sides of a square are each of length \(L \mathrm {~cm}\) and its area is \(A \mathrm {~cm} ^ { 2 }\)
Given that \(A\) is uniformly distributed on the interval [10,30]
- find \(\mathrm { P } ( L \geqslant 4.5 )\)
- find \(\operatorname { Var } ( L )\)
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