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dexar [7]
3 years ago
7

pls help The length of the entire border of the Unites States is approximately 32,000 miles, 5/ 8 of which is coastline. How lon

g is the coastline of the U.S., and how long are the land boundaries?
Mathematics
1 answer:
MaRussiya [10]3 years ago
7 0

Answer:

20000 is the coastline

12000 is the land

hope this helps

work----

32,000*5/8=

20,000

32,000-20,000=

12,000 which is the land

Step-by-step explanation:

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Answer:

5.96% probability that exactly 3 people in the sample are afraid of being alone at night.

Step-by-step explanation:

For each person, there are only two possible outcomes. Either they are afraid of being alone at night, or they are not. The probability of a person being afraid of being alone at night is independent of any other person. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

5% of Americans are afraid of being alone in a house at night.

This means that p = 0.05

If a random sample of 20 Americans is selected, what is the probability that exactly 3 people in the sample are afraid of being alone at night.

This is P(X = 3) when n = 20. So

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 3) = C_{20,3}.(0.05)^{3}.(0.95)^{17} = 0.0596

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5 0
3 years ago
Plz help and show work! easy points! It needs factored​
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3 years ago
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Answer:

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Step-by-step explanation:

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