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Mekhanik [1.2K]
2 years ago
15

You can buy 12 donuts for $9.60. What is the price for 1 donut?

Mathematics
2 answers:
hjlf2 years ago
8 0

Answer:

0.80 cents

Step-by-step explanation:

I divided 9.60 by 12.

irina1246 [14]2 years ago
5 0

To find the answer, just divide the amount of donuts to the price.

9.60 / 12 = 0.80

So, each donut costs .80 cents.

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The heights of a random sample of 50 college students showed a mean of 174.5 centimeters and a standard deviation of 6.9 centime
Minchanka [31]

Answer:

Step-by-step explanation:

Hello!

For me, the first step to any statistics exercise is to determine what is the variable of interest and it's distribution.

In this example the variable is:

X: height of a college student. (cm)

There is no information about the variable distribution. To estimate the population mean you need a variable with at least a normal distribution since the mean is a parameter of it.

The option you have is to apply the Central Limit Theorem.

The central limit theorem states that if you have a population with probability function f(X;μ,δ²) from which a random sample of size n is selected. Then the distribution of the sample mean tends to the normal distribution with mean μ and variance δ²/n when the sample size tends to infinity.

As a rule, a sample of size greater than or equal to 30 is considered sufficient to apply the theorem and use the approximation.

The sample size in this exercise is n=50 so we can apply the theorem and approximate the distribution of the sample mean to normal:

X[bar]~~N(μ;σ2/n)

Thanks to this approximation you can use an approximation of the standard normal to calculate the confidence interval:

98% CI

1 - α: 0.98

⇒α: 0.02

α/2: 0.01

Z_{1-\alpha /2}= Z_{1-0.01}= Z_{0.99} =2.334

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

174.5 ± 2.334* \frac{6.9}{\sqrt{50} }

[172.22; 176.78]

With a confidence level of 98%, you'd expect that the true average height of college students will be contained in the interval [172.22; 176.78].

I hope it helps!

4 0
2 years ago
Select the correct answer from each drop-down menu.
sdas [7]

Answer:

see below

Step-by-step explanation:

12 banana muffins, 10 chocolate muffins, 6 blueberry muffins, and 7 vanilla muffins.

The total number of muffins is 35 muffins

P(vanilla) = number of vanilla/ total

               = 7/35

               = 1/5

This is not likely to occur so it is an unlikely event

3 0
3 years ago
Read 2 more answers
A concession stand sells two sizes of popcorn. The small bag holds 20 ounces and costs $4, and the large bag holds 32 ounces and
Usimov [2.4K]

Step-by-step explanation:

The answer is in the picture

4 0
3 years ago
Read 2 more answers
A recipe called for the ratio to sugar to flour to be 5:1. If you used 35 ounce of sugar, how many ounces of flour would you nee
attashe74 [19]

Answer:

7 ounces.

Step-by-step explanation:

35 divided by 5 = 7.

8 0
3 years ago
Is 8 by it's self and flip on it's side infinite lol
lozanna [386]
Just because you flip and 8 does not mean it turns into an infinite sign, but it does definitely look like it :)
3 0
3 years ago
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