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2 years ago

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Arthur did not go to school for 36 days in a year. If his absence from school is 15 %, find the number of days the school opened

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1 answer:

Gwar [14]2 years ago

8 0

Answer:

can you mark me a brainlist

Step-by-step explanation:

thanks

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A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time student

Butoxors [25]

Answer: $(21.541,\ 23.059)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : $n=240$ , which is a large sample , so we apply z-test .

Sample mean : $\overline{x}=22.3$

Standard deviation : $\sigma= 6$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.960$

Now, a confidence interval at the 95% level of confidence will be :-

$22.3\pm(1.960)\dfrac{6}{\sqrt{240}}\\\\\approx22.3\pm0.759\\\\=(22.3-0.759,\ 22.3+0.759)\\\\=(21.541,\ 23.059)$

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3 years ago

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grigory [225]

The base's length is 8 and it's width is 7, so it's perimeter will be $2\cdot (7+8)=30$ . To find the lateral area you shoul multiply this with it's height. So, $30\cdot h=150\\ h=\frac { 150 }{ 30 } \\ h=5$ (h is height).

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3 years ago

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e-lub [12.9K]

Answer:

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Step-by-step explanation:

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2 years ago

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Tomtit [17]

Answer:

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1 year ago

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Using the formula C = 2, find the circumference of a circle with diameter of 20 inches. Round your answer to the nearest inch

Svetllana [295]

Answer:

The circumference is approximately 314 inches.

Step-by-step explanation:

3.14 x r^2

3.14 x 10^2

3.14 x 100

Circumference: 314

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2 years ago

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