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Oksi-84 [34.3K]
3 years ago
11

A coin is flipped 70 times and lands on tails 21 times. What is the relative frequency of the coin landing on tails?

Mathematics
2 answers:
DedPeter [7]3 years ago
8 0
It is 30%, because 21 out of 70 times is 30%.
vlada-n [284]3 years ago
8 0

It's 30%, what explanation is needed

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What is the expression in factored form? 9 x 2 − 4
attashe74 [19]

Answer:

(3x - 2)(3x + 2)

Step-by-step explanation:

9x² - 4 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b)

Thus

9x² - 4

= (3x)² - 2²

= (3x - 2)(3x + 2) ← in factored form

5 0
2 years ago
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Hey can someone help stats
dangina [55]
What’s the question?
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3 years ago
A fast food restaurant executive wishes to know how many fast food meals adults eat each week. They want to construct a 98% conf
adelina 88 [10]

Answer:

n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337

So the answer for this case would be n=1337 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

\sigma=1.1 represent the population standard deviation

n represent the sample size  

Solution to the problem

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =0.07 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

The critical value for 98% of confidence interval now can be founded using the normal distribution. And in excel we can use this formula to find it:"=-NORM.INV(0.01;0;1)", and we got z_{\alpha/2}=2.326, replacing into formula (b) we got:

n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337

So the answer for this case would be n=1337 rounded up to the nearest integer

3 0
3 years ago
Choose the equation for the situation "a fraction f multiplied by 13 equals 29". A. 1f⋅13=29 B. 3f=29 C. (f3⋅13)=29 D. 13f=29
Delicious77 [7]

Answer:

13f=29

Step-by-step explanation:

I hope this helps you out!

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2 years ago
What do you do on Brainly?
belka [17]
On Brainly, you ask questions associated with either homework, things your learning in class or questions you have in any of the categories listed. You also want to help others by answering their problems.
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3 years ago
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