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devlian [24]
2 years ago
14

A painting contractor paints with a brush at a rate of 192 square feet per hour. using a paint sprayer, she is able to cover 576

square feet per hour. she has a contract to paint a house with 1632 square feet of wall surface and 2400 square feet of ceiling space. she estimates she has 3 hours of brushwork to perform. how many hours will she need to use the sprayer in order to complete the job?
Mathematics
1 answer:
lara31 [8.8K]2 years ago
5 0

Hi there,

2400 + 1632 = 4032

3 * 192 = 576

4032 - 576 =>

3532 - 76 =>

3532 + 24 - 76 - 24

3556 - 100

3456


3456 / 576 => 6

Therefore, 6 hours of sprayer work

Hope this helps!

Sincerely,

Dus4nR

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According to the Question,

Given That, The diameters of ball bearings are distributed normally. The mean diameter is 87 millimeters and the standard deviation is 6 millimeters. Find the probability that the diameter of a selected bearing is greater than 84 millimeters.

  • In a set with mean and standard deviation, the Z score of a measure X is given by Z = (X-μ)/σ

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