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lukranit [14]
3 years ago
8

Uhh I’m confused lol

Mathematics
1 answer:
il63 [147K]3 years ago
6 0

Answer:

G

Step-by-step explanation:

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Find the total cost. 49.95 CD player; 5% tax
ad-work [718]
The total cost will be $52.44.
Please vote my answer brainliest! Thanks.
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2 years ago
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Find the value of XP if X is between P and Q. <br><br> XQ= 3k, XP= 7k - 2, PQ= 6k + 18
VMariaS [17]

If X is between P and Q, then PQ is the whole line segment and XQ and XP are line segments that add up to PQ. Therefore, you can make an equation where XQ and XP add up to PQ.

XQ + XP = PQ

(3k) + (7k - 2) = 6k + 18

Combine like terms.

10k - 2 = 6k + 18

Add 2 to both sides.

10k = 6k + 20

Subtract 6k from both sides.

4k = 20

Divide both sides by 4.

k = 5

Plug 5 for k into XP.

XP = 7(5) - 2 ⇒ 35 - 2

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2 years ago
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Shear strength measurements for spot welds have been found to have standard deviation 1 0 pounds per square inch (psi). If 100 t
Temka [501]

Answer:

P(\mu -1< \bar X

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Let X the random variable that represent the Shear strength of a population, and for this case we know the distribution for X is given by:

X \sim N(\mu,10)  

Where \mu and \sigma=10

And let \bar X represent the sample mean, the distribution for the sample mean is given by:

\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})

On this case  \bar X \sim N(\mu,\frac{10}{\sqrt{100}})

We are interested on this probability

P(\mu -1

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

If we apply this formula to our probability we got this:

P(\mu -1

=P(\frac{\mu -1-\mu}{\frac{10}{\sqrt{100}}}

And we can find this probability on this way:

P(-1

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(-1

5 0
3 years ago
(17.96 + 3.15) x 7<br> What is the answer????
Sholpan [36]

Answer:147.77

Step-by-step explanation:17.96+3.15=21.11 and 21.11x7= 147.77

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Select the correct answer.
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The second option is the answer
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