A company produces steel rods. The lengths of the steel rods are normally distributed with a...

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A company produces steel rods. The lengths of the steel rods are normally distributed with a...

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 172.5-cm and a standard deviation of 2.5-cm. Find P21, which is the length separating the shortest 21% rods from the longest 79%. P21 = -cm Enter your answer as a number accurate to 1 decimal place.

math Statistics-And-Probability

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Answer 1

Answer #1

Here,

X ~ Normal(172.5, 2.5²)

To find P₂₁ = x such that

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Answer 2

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