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2 years ago

Solve C= AB + D for B

Mathematics

2 answers:

saw5 [17]2 years ago

8 0

Answer:

d=-ab+c

Step-by-step explanation:

Evgesh-ka [11]2 years ago

8 0

c = ab + b

Subtract b to both sides

c - b = ab

divide a to both sides

(c -b)/a = b

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lord [1]

Answer:

c is the answer i hope this helps

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2 years ago

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Solve for u. 20 − (u · 0.9) = 4.7

alina1380 [7]

Answer:

20 - 0.9u = 4.7

-0.9u = 4.7 - 20

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Divide both sides by - 0.9

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Hope this helps.

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2 years ago

If ABC =30o , what is the measure of its complement CBD

Fantom [35]

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2 years ago

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alina1380 [7]

Answer:

Step-by-step explanation:

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3 years ago

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Required information An article presents a new method for timing traffic signals in heavily traveled intersections. The effectiv

Natasha2012 [34]

Answer:

$652.6-2.01\frac{311.7}{\sqrt{50}}=563.997$

$652.6+2.01\frac{311.7}{\sqrt{50}}=741.203$

So on this case the 95% confidence interval would be given by (563.997;741.203)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

$\bar X=652.6$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s=311.7 represent the sample standard deviation

n=50 represent the sample size

Soltuion to the problem

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:

$df=n-1=50-1=49$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,49)".And we see that $t_{\alpha/2}=2.01$

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

$652.6-2.01\frac{311.7}{\sqrt{50}}=563.997$

$652.6+2.01\frac{311.7}{\sqrt{50}}=741.203$

So on this case the 95% confidence interval would be given by (563.997;741.203)

6 0

2 years ago