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Anna11 [10]
3 years ago
11

Chris works in a tall building in downtown Columbia. We are going to view this skyscraper as a line segment. The building has an

endpoint of point A at the top of the building, and an endpoint C at the front door. The building is 43 stories tall. So we know that the length of AC 43 Chris works at point B on the building which is 12 stories above C. Find the length of AB?
Mathematics
1 answer:
iren [92.7K]3 years ago
7 0

Answer:

A at the top of the building, and an endpoint C at the front door. The building is 43 stories tall. So we know that the length of AC 43 Chris works at point

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According to a survey, 10% of Americans are afraid to fly. Suppose 1100 Americans are sampled. a) What is the probability that 1
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According to the survey, 10% of Americans are afraid to fly.

This means p=0.10 and q=1-0.10=0.90.

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a) We want to find the probability that 121 or more Americans in the survey are afraid to fly.

We first apply the continuity correction factor to get: P(X\ge121)=P(X\:>\:121-0.5)\\P(X\ge121)=P(X\:>\:120.5)

We now convert to Z-scores to get:

P(X\:>\:120.5)=P(z\:>\:\frac{120.5-110}{9.95})=1.06\\

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As a percentage, the probability is 14.46%

b) We want to find the probability that 165 or more Americans in the survey are afraid to fly.

We apply the CCF to get:

P(X\ge165)=P(X\:>\:165-0.5)\\P(X\ge165)=P(X\:>\:164.5)

We convert to z-scores:

P(X\:>\:164.5)=P(z\:>\:\frac{164.5-110}{9.95})=5.48

From the normal distribution, P(z>164.5)=0

c)  First, 8% of 1100 is 88.

We want to find the probability that 88 or less Americans in the survey are afraid to fly.

We apply the CCF to get:

P(X\le88)=P(X\:

We convert to z-scores:

P(X\:

From the normal distribution, P(z>\:-2.16)=0.0154

As a percentage, we get 1.54%

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3 years ago
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