(i) Find the probability that a randomly chosen small rod has diameter greater than 2.15 cm. (ii) A box contains one small rod and one large rod. Find the probability that at least one of the rods has diameter greater than 2.15 cm.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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A machine produces small rods and large rods. The diameters of small rods are normally distributed with
mean 2 cm and standard deviation 0.12 cm. The diameters of large rods are normally distributed with mean
2.2 cm and standard deviation 0.15 cm.
(i) Find the probability that a randomly chosen small rod has diameter greater than 2.15 cm.
(ii) A box contains one small rod and one large rod. Find the probability that at least one of the rods has
diameter greater than 2.15 cm.
Transcribed Image Text:A machine produces small rods and large rods. The diameters of small rods are normally distributed with mean 2 cm and standard deviation 0.12 cm. The diameters of large rods are normally distributed with mean 2.2 cm and standard deviation 0.15 cm. (i) Find the probability that a randomly chosen small rod has diameter greater than 2.15 cm. (ii) A box contains one small rod and one large rod. Find the probability that at least one of the rods has diameter greater than 2.15 cm.
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