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Roman55 [17]
2 years ago
6

Plz help anyone please

Mathematics
2 answers:
madam [21]2 years ago
8 0
If you wanted to go to the gym for only 4 months basic gym would be cheaper but if you wanted to go for a whole year then you’d spend less money at the holiday gym

Hope thia helped can you mark me brainliest please
choli [55]2 years ago
6 0

Answer:

Basic gym, Holiday gym

Step-by-step explanation:

It is the cheapest in bold.

Holiday: 13+5(4)=33  13+5(12)=73

Basic: 7(4)=28       7(12)=84

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Y=4x+1 <br> Do x and y vary directly?
vladimir1956 [14]
<span>Slope = 8.000/2.000 = 4.000 
x-intercept = 1/-4 = -0.25000<span> 
y-intercept = 1/1 = 1.00000

</span></span> <span> y-(4*x+1)=0 </span>
6 0
3 years ago
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained i
Scorpion4ik [409]

Answer:

a) We need a sample size of at least 3109.

b) We need a sample size of at least 4145.

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}}

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

(a) he uses a previous estimate of 25​%?

we need a sample of size at least n.

n is found when M = 0.02, \pi = 0.25. So

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

0.02 = 2.575\sqrt{\frac{0.25*0.75}{n}}

0.02\sqrt{n} = 2.575\sqrt{0.25*0.75}

\sqrt{n} = \frac{2.575\sqrt{0.25*0.75}}{0.02}

(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.25*0.75}}{0.02})^{2}

n = 3108.1

We need a sample size of at least 3109.

(b) he does not use any prior​ estimates?

When we do not use any prior estimate, we use \pi = 0.5

So

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

0.02 = 2.575\sqrt{\frac{0.5*0.5}{n}}

0.02\sqrt{n} = 2.575\sqrt{0.5*0.5}

\sqrt{n} = \frac{2.575\sqrt{0.5*0.5}}{0.02}

(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.5*0.5}}{0.02})^{2}

n = 4144.1

Rounding up

We need a sample size of at least 4145.

8 0
3 years ago
Your throw your ball into a air from height of 4.2
melamori03 [73]
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3 years ago
Please help :) !!!!!!!!!!!
Mrrafil [7]
8. 70.5* 10. 30* 12. 5.1*
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2 years ago
Zach needs a new pair of running shoes. If the shoes he want to buy are $129.00 and he has 25% off coupon, what is the new price
Alexxandr [17]

129.00 divided by 25% will give you the answer try it tell me if it worked :)

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3 years ago
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