TF.10 The diameter X in inches of a certain brand of tennis balls has normal distribution with mean μ = 2.65 and standard deviation σ = .018. Acceptable balls have diameters between 2.62 and 2.68...

TF.10

The diameter X in inches of a certain brand of tennis balls has normal distribution with mean μ = 2.65 and standard deviation
σ
= .018. Acceptable balls have diameters between 2.62 and 2.68 inches.

a) What proportion of tennis balls of this brand are acceptable?