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Usimov [2.4K]
3 years ago
6

Scott is taking a 3/4-hour dance class twice a week for 8 weeks. How many hours will Scott have spent in dance class at the end

of the 8 weeks?
answer choices: A=6 hours, B=8 hours, C=12 hours, D=16 hours. PLEASE HELP ME SOLVE THIS. ill have more questions when you answer this thank you... it will cost more pts
Mathematics
1 answer:
Eva8 [605]3 years ago
6 0
One class is 45 minutes.
That's 90 minutes per week.
8 weeks times 90 minutes is 720 minutes.
720 minutes divided by 60 minutes in the hour is 12 hours. Answer C.
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Answer:

42.40

Step-by-step explanation:

8 0
3 years ago
In a sample of 70 stores of a certain​ company, 62 violated a scanner accuracy standard. It has been demonstrated that the condi
uysha [10]

Answer:

We need at least 243 stores.

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 of the interval is:

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

For this problem, we have that:

n = 70, p = \frac{62}{70} = 0.886

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.

Determine the number of stores that must be sampled in order to estimate the true proportion to within 0.04 with 95​% confidence using the​ large-sample method.

We need at least n stores.

n is found when M = 0.04. So

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

0.04 = 1.96\sqrt{\frac{0.886*0.114}}{n}}

0.04\sqrt{n} = 1.96\sqrt{0.886*0.114}

\sqrt{n} = \frac{1.96\sqrt{0.886*0.114}}{0.04}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.886*0.114}}{0.04})^{2}

n = 242.5

Rounding up

We need at least 243 stores.

5 0
3 years ago
Tom and jasper have the same percentage of blue marbles in their bags of marble tom has 5 blue marbles and 20 total marbles jasp
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3 years ago
Jamie is selling tickets at a whale watch at a local beach.The tickets cost $24.40 for an adult and $14.50 for a child.Jamie ear
wariber [46]
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.3(24.40a + 14.50c)

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.3 * 24.40a + .3 * 14.50c
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7 0
3 years ago
a rectangular prism measures 2 in by 4 in by 8 in what is the side length of a cube with the same volume
Umnica [9.8K]
<h3>✽ - - - - - - - - - - - - - - - ~<u>Hello There</u>!~ - - - - - - - - - - - - - - - ✽</h3>

➷ First find the volume of the rectangular prism:

2 x 4 x 8 = 64

Now you need to cube root it, this would be because all lengths of a cube are equal:

\sqrt[3]{64} = 4

The side length would be 4 inches.

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

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↬ ʜᴀɴɴᴀʜ ♡

7 0
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