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4 years ago

What's 5 times 2 times 3

Mathematics

2 answers:

Ber [7]4 years ago

8 0

30 is the answer to your question

tatuchka [14]4 years ago

4 0

30 is the correct answer. 5 x 2 = 10, 10 x 3 = 30

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Problem 2.4 You would like to evaluate the probability of success for testing a batch of n processors. To start out, let's assum

Blizzard [7]

Answer:

The answer is " $\bold{n_{C_{k}}}\\$ "

Step-by-step explanation:

$\to {n_{C_{k}}} = \frac{n!}{K! (n-k)!}$

For Example:

if n=5 and k=2

$\to {5_{C_{2}}} = \frac{5!}{2! (5-2)!}$

$= \frac{5!}{2! (3)!}\\\\= \frac{5!}{2! \times 3!}\\\\= \frac{5 \times 4 \times 3 \times 2 \times 1}{2 \times 1 \times 3 \times 2 \times 1}\\\\= \frac{5 \times 4 }{2 \times 1 } \\\\= \frac{5 \times 4 }{2} \\\\= 5 \times 2 \\\\= 10 \\\\$

4 0

4 years ago

Use the normal distribution to find a confidence interval for a difference in proportions p1-p2 given the relevant sample result

9966 [12]

Answer:

a) $\hat p_1 -\hat p_2= 0.2-0.35= -0.15$

b) $ME= 2.58 \sqrt{\frac{0.2(1-0.2)}{60} +\frac{0.8(1-0.8)}{100}} =0.169$

c) $(0.2-0.35) - 2.58 \sqrt{\frac{0.2(1-0.2)}{60} +\frac{0.8(1-0.8)}{100}} =-0.319$

$(0.2-0.35) + 2.58 \sqrt{\frac{0.2(1-0.2)}{60} +\frac{0.8(1-0.8)}{100}} =0.0185$

And the 99% confidence interval would be given (-0.319;0.0185).

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".

$p_1$ represent the real population proportion 1

$\hat p_1=0.2$ represent the estimated proportion 1

$n_1=60$ is the sample size required 1

$p_2$ represent the real population proportion for 2

$\hat p_2 =0.35$ represent the estimated proportion 2

$n_2=100$ is the sample size required for Brand B

$z$ represent the critical value for the margin of error

Solution to the problem

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

The confidence interval for the difference of two proportions would be given by this formula

$(\hat p_1 -\hat p_2) \pm z_{\alpha/2} \sqrt{\frac{\hat p_1(1-\hat p_2)}{n_1} +\frac{\hat p_2 (1-\hat p_2)}{n_2}}$

Part a

The best estimate is given by:

$\hat p_1 -\hat p_2= 0.2-0.35= -0.15$

Part b

For the 99% confidence interval the value of $\alpha=1-0.99=0.01$ and $\alpha/2=0.005$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=2.58$

The margin of error is given by:

$ME= 2.58 \sqrt{\frac{0.2(1-0.2)}{60} +\frac{0.8(1-0.8)}{100}} =0.169$

Part c

And replacing into the confidence interval formula we got:

$(0.2-0.35) - 2.58 \sqrt{\frac{0.2(1-0.2)}{60} +\frac{0.8(1-0.8)}{100}} =-0.319$

$(0.2-0.35) + 2.58 \sqrt{\frac{0.2(1-0.2)}{60} +\frac{0.8(1-0.8)}{100}} =0.0185$

And the 99% confidence interval would be given (-0.319;0.0185).

4 0

4 years ago

Which group of numbers is listed from least to greatest?

Sav [38]

Answer:

-2, -1, 0, 4, 9

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

I don’t understand what Is the answer since I’m not good with percentages

TiliK225 [7]

Answer:

9 students

75 percent of 12 = 9

Search for calculator. Type, "75" then click the percent symbol, then type "12." It should give you the right answer.

4 0

3 years ago

What is the value of x? <br><br> Enter your answer in the box.<br><br> __mm

VashaNatasha [74]

You can set up a ratio as follows:
$\frac{x-22}{87.5}= \frac{22}{77}$

Solve for x by cross-multiplying:
$(x-22)(77) = (87.5)(22)$
$x = \frac{(87.5)(22)}{77} + 22= 47.01$

Since we need the answer in mm and right now we have it in feet, we need a conversion ratio. After googling it, the conversion ratio is: 1ft = 304.8mm
$47.01(304.8) = 14326.64$

So, the answer is 14326.64 mm.

6 0

4 years ago