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neonofarm [45]
3 years ago
5

At the beginning of a population study, a city had 360,000 people. Each year since, the population has grown by 4.3%.

Mathematics
1 answer:
dangina [55]3 years ago
6 0

Answer: y = 360,000 times t + 4.3%

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.

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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

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

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