Let y be a weight in grams of a bar of Ivory soap produced in a designated factory location. Assume that y is normally distributed with µ = 100 and o² = 25. a) What proportion of the bars of soap produced in this factory have weight below 100g? b) The specifications for this item are 100 ± 12. What proportion of these items are "out of specification"? c) What value of c makes the inequality P(y < c) = 0.05 true?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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3. Let y be a weight in grams of a bar of Ivory soap produced in a designated factory
location. Assume that y is normally distributed with µ = 100 and o² = 25.
a) What proportion of the bars of soap produced in this factory have weight below
100g?
b) The specifications for this item are 100 ± 12. What proportion of these items are
"out of specification"?
c) What value of c makes the inequality P(y < c) = 0.05 true?
Transcribed Image Text:3. Let y be a weight in grams of a bar of Ivory soap produced in a designated factory location. Assume that y is normally distributed with µ = 100 and o² = 25. a) What proportion of the bars of soap produced in this factory have weight below 100g? b) The specifications for this item are 100 ± 12. What proportion of these items are "out of specification"? c) What value of c makes the inequality P(y < c) = 0.05 true?
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