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4 years ago

I don’t know what to do after this

Mathematics

2 answers:

aalyn [17]4 years ago

8 0

Simplify 123/8 then multiply 5/8 and x2 then add those two and subtract 6 sry if it's confusing

coldgirl [10]4 years ago

3 0

Yeah what he/she said

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Use a number line to find the quotient 3/4 divided by 1/8

likoan [24]

Answer:

Step-by-step explanation:

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3 years ago

The price of a share of one stock rose from $89 to $134. Find percent increase

mezya [45]

It increased by 45%

7 0

4 years ago

Suppose the germination periods, in days, for grass seed are normally distributed. If the population standard deviation is 3 day

KatRina [158]

Answer:

The minimum sample size is needed to be 90% confident that the sample mean is within 1 day of the true population mean is 25.

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 the population standard deviation is 3 days, what minimum sample size is needed to be 90% confident that the sample mean is within 1 day of the true population mean?

This is n when $\sigma = 3, M = 1$ . So

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

$1 = 1.645*\frac{3}{\sqrt{n}}$

$\sqrt{n} = 3*1.645$

$(\sqrt{n})^{2} = (3*1.645)^{2}$

$n = 24.3$

Rouding up to the nearest integer, 25.

The minimum sample size is needed to be 90% confident that the sample mean is within 1 day of the true population mean is 25.

4 0

3 years ago

Simplify to create an equivalent expression. 2(3r+7)−(2+r)

tamaranim1 [39]

2(3r+7)−(2+r)

Use distributive property:

6r + 14 - 2 - r

Simplify by combining like terms:

5r +12

7 0

4 years ago

LAUGH A LITTLE

Slav-nsk [51]

Answer:

haha

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers