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faltersainse [42]
3 years ago
14

In a stairway, the slope of the handrail is the ratio of the riser to the tread. If the tread is 12 inches long and the riser is

8 inches long, find the slope.
(image)

a.
2/5
c.
2/3
b.
3/2
d.
5/2

Mathematics
1 answer:
harkovskaia [24]3 years ago
7 0
C. 2/3 (8/12 simplified is 2/3)
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And if we solve for a we got

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Step-by-step explanation:

Previous concepts

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As we can see on the figure attached the z value that satisfy the condition with 0.9 of the area on the left and 0.1 of the area on the right it's z=1.28. On this case P(Z<1.28)=0.9 and P(z>1.28)=0.1

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