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ASHA 777 [7]
3 years ago
11

"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment a

lso reduces the strength of the fabric. The breaking strength of untreated fabric is normally distributed with mean 51.8 pounds and standard deviation 2.9 pounds. The same type of fabric after treatment has normally distributed breaking strength with mean 20.9 pounds and standard deviation 1.8 pounds. A clothing manufacturer tests 4 specimens of each fabric. All 8 strength measurements are independent. (Round your answers to four decimal places.)
(a) What is the probability that the mean breaking strength of the 4 untreated specimens exceeds 50 pounds?

(b) What is the probability that the mean breaking strength of the 4 untreated specimens is at least 25 pounds greater than the mean strength of the 4 treated specimens?
Mathematics
1 answer:
Elis [28]3 years ago
6 0
A.) Let x be a random variable representing the mean breaking strenght of the 4 untreated specimens.
P(x > 50) = 1 - P(x < 50) = 1 - P(z < (50 - 51.8)/2.9) = 1 - P(z < -0.6207) = 1 - [1 - P(z < 0.6207)] = P(z < 0.6207) = 0.7326

b.) P((x - y) > 25) = P(z > 25 - (51.8 - 20.9)/sqrt(2.9^2 + 1.8^2)) = P(z > (25 - 30.9)/sqrt(11.65)) = P(z > -1.7286) = 1 - P(z < 1.7286) = 1 - 0.95806 = 0.04194
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Complete Question:

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Answer/Step-by-step explanation:

Jocelyn used a wrong equation and statement.

Here's what she should have stated and done.

Using the converse of Pythagorean Theorem, which says that a triangle with sides a, b, and c is a right triangle if it satisfy the statement: a² + b² = c².

Where, c is the hypotenuse which is the longest leg. While a and b are the side lengths of the other two legs.

Therefore, in this case,

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Let's check if it's true.

2,025 = 2,025 (this is true)

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