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3 years ago

Find three consecutive even integers such that the sum of twice the smallest and 4 times the largest is 304.

Mathematics

1 answer:

Veronika [31]3 years ago

7 0

Answer:

gdgdgdgdgddggddggdgddggd

Step-by-step explanation:

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The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident th

Oksana_A [137]

Answer:

The minimum sample size that should be taken is 62.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken

This is n when $M = 1, \sigma = 4$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$1 = 1.96*\frac{4}{\sqrt{n}}$

$\sqrt{n} = 4*1.96$

$(\sqrt{n})^{2} = (4*1.96)^{2}$

$n = 61.5$

The minimum sample size that should be taken is 62.

8 0

3 years ago

$90 is what percent of $100? I need help.

serg [7]

90%

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 0

3 years ago

10 cm 8 cm 2.5 cm 8 cm 6 cm 2.5 cm what’s the surface area

DIA [1.3K]

Answer:

10+8+2.5+8+6+2.5=37 .

ok you are understand or bot

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3 years ago

Can someone help with this question

egoroff_w [7]

M = (t+1)/(t-3)
m(t-3) = t+1
mt-3m = t+1
(m-1)t = 3m+1
t = (3m+1)/(m-1)

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3 years ago

Consider the equation: x^2 = - 8x - 7

Airida [17]

Answer: The expression is not factorable with rational numbers.

Step-by-step explanation:

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3 years ago

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