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MAXImum [283]
3 years ago
5

On a standardized exam, the scores are normally distributed with a mean of 135 and a

Mathematics
1 answer:
labwork [276]3 years ago
3 0

Answer:

-1

Step-by-step explanation:

mean, mu = 135.

Standard deviation = 20

X = 115

use the z score formula : z = \frac{x-mu}{standard deviation}

to get (115-135)/20 = -1

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1 point
valentina_108 [34]

Answer:

34

Step-by-step explanation:

7 0
4 years ago
A ballasted roof is flat and covered with gravel to hold the roofing material in place. Adam plans to cover the roof in the diag
Yuri [45]

Answer:

Area = 2,031ft^2

Total weight of gravel on the roof = 24,372 pounds

Step-by-step Explanation:

The area Adams planned to cover with gravel can be divided into 3 rectangles as shown in the diagram attached.

We would have 3 rectangles. See the attachment below to check out how we arrive at the dimensions of the 3 rectangles.

Area of rectangle = L*W

Area to be covered by gravel = area of rectangle 1 + area of rectangle 2 + area of rectangle 3

Area to be covered with gravel = (30*17) + (13*9) + (52*27)

Area = (30*17) + (13*9) + (52*27) = 2,031ft^2

Total weight of gravel on the roof = 12 pounds per square foot multiplied by total area of the roof to be covered = 12 * 2031 = 24,372 pounds

5 0
3 years ago
Verify trig identity. Show steps and give reason for each step. <br><br> (cosx)(tanx)(cscx)=1
yKpoI14uk [10]
Tan(x) = sin(x) / cos(x)
Csc(x) = 1/ sin(x)

You'll see this better if I use latex.

\frac{cos(x)}{1} * \frac{sin(x)}{cos(x)} *  \frac{1}{sin(x)}

Now just cancel numerators with denominations. They all disappear. The cancelations leave 1 on both the numerator and denominator.
4 0
3 years ago
Read 2 more answers
<img src="https://tex.z-dn.net/?f=1.87%20%5Cdiv%2022" id="TexFormula1" title="1.87 \div 22" alt="1.87 \div 22" align="absmiddle"
Naddika [18.5K]
3.74
Just get a calculator lol
3 0
4 years ago
From their location in the diagram, what are two possible values for n and m?
Makovka662 [10]

Answer:

the answer is A

Step-by-step explanation:

8 0
4 years ago
Read 2 more answers
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