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Margarita [4]
3 years ago
8

Alice has 2 pennies, 3 nickels, 4 dimes, 4 quarters and 1 loonie in her pocket. If one coin is drawn randomly, what is the theor

etical probability of getting a quarter?
Mathematics
1 answer:
Leviafan [203]3 years ago
4 0
Answer: 4/14

Step by step: there are 14 coins and only 4 quarters so 4/14
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Can you do 2 problems? and then someone else do the other 2 ty!
Lynna [10]

Answer:

5.) MIGHT I SAID MIGHT be 20+16+12=48km squared for perimeter and 192 (im not sure really) for area

i can only do one I HOPE this helps probably not tho

Step-by-step explanation:

6 0
2 years ago
What is w for -3w = -7(w+1)
Alchen [17]
-3w= -7w-7 =
-3w+7w = -7w+7w - 7 =
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4w/4 = -7/4 =
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3 0
3 years ago
At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population pro
Gnom [1K]

Answer:

A sample of 1068 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population proportion?

We need a sample of n.

n is found when M = 0.03.

We have no prior estimate of \pi, so we use the worst case scenario, which is \pi = 0.5

Then

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.03 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.03\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.03}

(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.03})^{2}

n = 1067.11

Rounding up

A sample of 1068 is needed.

8 0
3 years ago
place an x in the table to show the precent decrease from the first number to the second number. giving brainliest!!
dezoksy [38]

Answer:

150 to 117 is 25%

340 to 255 is 25%

450 to 351 is 22%

Step-by-step explanation:

4 0
3 years ago
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Find the modulus and the unit vector along the sum of the vectors. - r₁ +r₂ +r3 given that r₁ = 2i+j+4k - r₂ = 3i-2j+7k, r3 = 5i
bazaltina [42]

j+8k

first -2i+j+4k-3i-2j+7k+5i+2j-3k

8 0
2 years ago
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