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3 years ago

20 hours put into degrees

Mathematics

1 answer:

dexar [7]3 years ago

5 0

Answer:

300°

Step-by-step explanation:

If 24 hours is 360°, then ...

(20 hours)/(24 hours) × 360° = 300°

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The mean waiting time at the drive-through of a fast-food restaurant from the time the food is ordered to when it is received is

alexira [117]

Answer:

a) And if we replace we got: $\bar X= 78$

$s = 15.391$

b) $78-3.25\frac{15.391}{\sqrt{10}}=62.182$

$78-3.25\frac{15.391}{\sqrt{10}}=93.818$

So on this case the 99% confidence interval would be given by (62.182;93.818)

Step-by-step explanation:

Dataset given: 109 67 58 76 65 80 96 86 71 72

Part a

For this case we can calculate the sample mean with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

And if we replace we got: $\bar X= 78$

And the deviation is given by:

$s =\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

And if we replace we got $s = 15.391$

Part b

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=10-1=9$

Since the Confidence is 0.99 or 99%, the value of $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,9)".And we see that $t_{\alpha/2}=3.25$

Now we have everything in order to replace into formula (1):

$78-3.25\frac{15.391}{\sqrt{10}}=62.182$

$78-3.25\frac{15.391}{\sqrt{10}}=93.818$

So on this case the 99% confidence interval would be given by (62.182;93.818)

8 0

3 years ago

In a weightless environment, an astronaut lose about 1.5% calcium in their bodies per month. Suppose some astronauts flew to Mar

Usimov [2.4K]

Answer:

12.3 months

Step-by-step explanation:

You want the number of months (m) such that ...

1 - 17% = (1 -1.5%)^m

Taking logarithms:

log(0.83) = m·log(0.985)

m = log(0.83)/log(0.985) ≈ 12.3 . . . . months

5 0

3 years ago

Is the answer 4? because i don't know if i did this right

ZanzabumX [31]

Answer:

yea no

Step-by-step explanation:

Logic. try again

3 0

3 years ago

Describe in detail how you would create a number line with the following points: 1, 3.25, the opposite of 2, and – (–4fraction o

gogolik [260]

Yes because yes and yes

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3 years ago

chole is baking cookies to sell in boxes of 12 cookies.if she bakes 122 cookies,calculate the number she can fill and the number

Alborosie

Answer:

she can fill 10 boxes of 12 cookies and the the left over will be 2 cookies.

Step-by-step explanation:

first we have to find out what multiple of 12 is closest to 122 which is 12 x 10=120.

then minus 120 from 122 which gives 2 remaining cookies

8 0

3 years ago