Help with Algebra Word Problem

label Algebra
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The breaking strength (in pounds) of a certain new synthetic is distributed, with a mean of 195 and a variance of 25. If the breaking strength is less than 185 pounds. What is the probability that a single, piece of material will be defective?

Dec 11th, 2014

P(defective) = P( z < (185-195)/25) = P(z < -2/5) NORMSDIST(-.4) = ?
I got that far . Hoped helped some

Dec 11th, 2014

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Dec 11th, 2014
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Dec 11th, 2014
Oct 19th, 2017
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