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Tju [1.3M]
2 years ago
14

The weights of 12-year old boys are normally distributed with a mean of 89 lbs. If 68% of 12 year old boys are between the weigh

ts of 82.7 lbs and 95.3 lbs, what is the standard deviation?
A
34
B
6.3
C
3.5
D
12.6
Mathematics
1 answer:
cricket20 [7]2 years ago
6 0
This is the answer B. This is because if you want to be treated the way you do treat people.
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Joe's Painting charges $100 plus $20 per hour to paint the exterior of your home. Steve's Painting charges $120 plus $15 per hou
Tanzania [10]

Joe's Painting: 20x + 100 = y

Steve's Painting: 15x + 120 = y

x = hours worked

y = total income

We can find when the two equations intersect by making them equal to each other. That means we put an equal sign in the middle. So, it would look something like this:

20x + 100 = 15x + 120

First, we have to move the 100 by subtracting it from both sides.

20x = 15x + 120 - (100)

20x = 15x + 20

Then, we need to move the 15x by subtracting it from both sides.

20 - (15x) = 20

5x = 20

Lastly, we need to divide 5 from both sides.

5x = 20/5

x = 4

Therefore, Joe and Steve would have to work for 4 hours in order for their models to be equal to each other.

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Find the slope given (2,7) and (4,4)
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<h3>Answer:</h3>

m= -3/2

<h3>Step by step:</h3>

m=y1-y2/x1-x2     = 4-7/4-2      = -3/2

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Answer:

300+90+9

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Step-by-step explanation:

399-45=354

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