P(X > x) = 0.12
or, P((X - )/ > (x - )/) = 0.12
or, P(Z > (x - 71.7)/7.2) = 0.12
or, P(Z < (x - 71.7)/7.2) = 0.88
or, (x - 71.7)/7.2 = 1.175
or, x = 1.175 * 7.2 + 71.7
or, x = 80
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