Question 1175747

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0r 
one may use TI Calculator or similarly a $20 Casio fx-115 ES plus 
Normal distribution:   μ = 86 and    σ - 4

P(x < 80) = P( x ≤ 80 ) = normcdf(-9999, 80, 4, 86) = .06680720128
Commonly rounded to 4 decimals points 0r .0668


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