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salantis [7]
3 years ago
15

The length, in feet, of a certain structural steel beam is normally distributed with a mean of 8 feet and a standard deviation o

f 4 inches. Quality requirements demand a beam to be rejected if the length is more than 10 inches different from the mean. What percentage of the beams will be rejected? (Round your answer to two decimal places.)
Mathematics
1 answer:
inessss [21]3 years ago
4 0

Answer:

The percentage of the beams will be rejected is 1.24%

Step-by-step explanation:

Given information:

Mean, μ = 8 ft

standard deviation, σ = 4 inches

Quality requirements demand a beam to be rejected if the length is more than 10 inches

P = P (- 10/4< z < 10/4)

   = P (-2.5 < z < 2.5)

    = P (z < 2.5) - P(z< -2.5)

    = 0.012419

The percentage of the beams will be rejected is 1.24%

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A blueberry shortcake 49 feet, 4 inches long and 9 feet wide was made in Canada on September 19, 1995. The height of the shortca
neonofarm [45]

Answer:

296 cubic feet

Step-by-step explanation:

First and foremost, you have to have everything in either feet or inches.  Right now they are in both.  Since the answer is asked for in feet, let's convert everything to feet.  The width is already in feet, so that's good.

However, even though the length is 49 feet, we still have to convert the 4 inches part of that to feet.  Using the fact that there are 12 inches in a foot:

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49\frac{1}{3}ft

Convert that to improper to make the multiplication easier in the end:

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3 years ago
10m^2-20m+48=0 solve by completing the square please show your work please.
sergejj [24]

Answer:

m = {-6, -4}

Step-by-step explanation:

<u><em>Subproblem 1:</em></u>

Set the factor '(6 + m)' equal to zero and attempt to solve:

Simplifying

6 + m = 0

Solving

6 + m = 0

Move all terms containing m to the left, all other terms to the right.

Add '-6' to each side of the equation.

6 + -6 + m = 0 + -6

Combine like terms: 6 + -6 = 0

0 + m = 0 + -6

m = 0 + -6

Combine like terms: 0 + -6 = -6

m = -6

Simplifying

m = -6

<u><em>Subproblem 2:</em></u>

Set the factor '(4 + m)' equal to zero and attempt to solve:

Simplifying

4 + m = 0

Solving

4 + m = 0

Move all terms containing m to the left, all other terms to the right.

Add '-4' to each side of the equation.

4 + -4 + m = 0 + -4

Combine like terms: 4 + -4 = 0

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Combine like terms: 0 + -4 = -4

m = -4

Simplifying

m = -4

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3 years ago
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