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Ulleksa [173]
3 years ago
15

A 100 foot rope weighs 200 pounds. It is hanging vertically from the top of a tall building. After "x" feet have already been li

fted, how much does the remainder of the rope (the hanging part) weigh? O2 pounds 200 pounds O2(100 – 2 pounds
Mathematics
1 answer:
Levart [38]3 years ago
5 0

Answer:

2*(100-X)

Step-by-step explanation:

Total length = 100 ft

Total weight =200 pounds

Assuming that the rope has an uniformly distributed weight, its weight per feet is:

W_f = \frac{200}{100} =2\ lbs/ft

If "x" feet have already been lifted, the length left to be lifted is 100 - x.

Therefore, the weight of the remainder of the rope is:

W=2*(100-X)

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Yes, there is enough evidence to say the proportions are the same.

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Null hypothesis: The proportions are the same.

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Data given:

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p2 = 48% = 0.48

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pooled proportion (p) = (n1p1 + n2p2) ÷ (n1 + n2) = (200×0.51 + 150×0.48) ÷ (200 + 150) = 174 ÷ 350 = 0.497

Test statistic (z) = (p1 - p2) ÷ sqrt[p(1-p)(1/n1 + 1/n2) = (0.51 - 0.48) ÷ sqrt[0.497(1-0.497)(1/200 + 1/150)] = 0.03 ÷ 0.054 = 0.556

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Conclusion:

Fail to reject the null hypothesis because the test statistic 0.556 falls within the region bounded by the critical values.

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