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sergij07 [2.7K]
3 years ago
7

Joey wants to collect 20 coins from foreign countries. If he has 3 coins so far, what percent of his collection is complete?

Mathematics
2 answers:
irinina [24]3 years ago
8 0

Answer:

17%

Step-by-step explanation:

I think you maybe have to subtract

Sphinxa [80]3 years ago
8 0

Answer:

15%

hope this helps!

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Line segment CD is shown on a coordinate grid:
Jet001 [13]
A) would be your answer hope this helps. :) 
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3 years ago
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What is the equation for (4, 9.4) and (-3, -9.5)
Kipish [7]

Answer: I got an eqaution I hope it is basic

Step-by-step explanation:

4 times 9

9 - (-3 ) times -9 + 5

8 0
3 years ago
Which is equivalent to (2^-3)^4 <br><br> 1/2^12<br><br> 2<br><br> -2^12<br><br> 1/2^7
sleet_krkn [62]

Answer:

The answer is First option

1/2^12 .

\frac{1}{2^{12} }

Step-by-step explanation:

Given:

(2^-3)^4

i.e

(2^{-3} )^{4}

To Find:

(2^{-3} )^{4}=?

Solution:

Law of Indices

(x^{a}) ^{b} =x^{a\times b}\\and\\x^{-1}=\frac{1}{x}

Using the above Property we get

∴ (2^{-3} )^{4}=2^{-3\times 4} \\\\ (2^{-3} )^{4}=2^{-12} \\\\(2^{-3} )^{4}= \frac{1}{2^{12} }

The answer is First option

1/2^12 .

(2^{-3} )^{4}=\frac{1}{2^{12} }

6 0
3 years ago
Brandon's Crackers will make 8,648 ounces of cheese crackers next year. The company plans to put the crackers into 47-ounce boxe
Murljashka [212]

Answer:

184 boxes

Step-by-step explanation:

8648/47 = 184

8 0
2 years ago
An article reports that 1 in 500 people carry the defective gene that causes inherited colon cancer. In a sample of 2500 individ
Ne4ueva [31]

Answer:

The approximate distribution of the number who carry this gene is approximately normal with mean \mu = 5 and standard deviation \sigma = 2.23

Step-by-step explanation:

For each person, there are only two possible outcomes. Either they carry the defective gene that causes inherited colon cancer, or they do not. The probability of a person carrying this gene is independent from other people. So the binomial probability distribution is used to solve this question.

A sample of 2500 individuals is quite large, so we use the binomial approximation to the normal to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

E(X) = np

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that \mu = E(X), \sigma = \sqrt{V(X)}.

An article reports that 1 in 500 people carry the defective gene that causes inherited colon cancer.

This means that p = \frac{1}{500} = 0.002

In a sample of 2500 individuals, what is the approximate distribution of the number who carry this gene?

n = 2500

So

\mu = E(X) = np = 2500*0.002 = 5

\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{2500*0.002*0.998} = 2.23

So the approximate distribution of the number who carry this gene is approximately normal with mean \mu = 5 and standard deviation \sigma = 2.23

4 0
3 years ago
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