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Hi
Normal Distribution: µ = 525 and σ = 90
Using TI or similarly an inexpensive calculator like a Casio fx-115 ES plus
Continuous curve
A RANDOMLY SELECTED SALES LADY selected:
9999 a place older:
P(x > 600) = P(x ≥ 600) = normalcdf( 600, 9999, 525, 90) = .2023
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Wish You the Best in your Studies.