Calculate 3(8-6)<br><img src="https://tex.z-dn.net/?f=3%288%20-%206%29" id="TexFormula1" title="3(8 - 6)" alt="3(8

Write the fractions for 9/12

Flauer [41]

9/12 divide by 3 equals 3/4

9/12 x 2 = 18/24

this is the only two things I can show you I hope this helps

5 0

3 years ago

A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 95

Galina-37 [17]

Answer:

The minimum sample size required for the estimate is 345.

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

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

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

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.

The standard deviation is known to be 1.8.

This means that $\sigma = 1.8$

What is the minimum sample size required for the estimate?

This is n for which M = 0.19. So

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

$0.19 = 1.96\frac{1.8}{\sqrt{n}}$

$0.19\sqrt{n} = 1.96*1.8$

$\sqrt{n} = \frac{1.96*1.8}{0.19}$

$(\sqrt{n})^2 = (\frac{1.96*1.8}{0.19})^2$

$n = 344.8$

Rounding up to the next integer:

The minimum sample size required for the estimate is 345.

8 0

3 years ago

Suppose the ages of multiple birth mothers (4 or more births) are normally distributed with a mean age of 35.5 years and a stand

Ann [662]

Answer:

40.65% of these mothers are between the ages of 32 to 40

23.27% of these mothers are less than 30 years old

37.07% of these mothers are more than 38 years old

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 35.5, \sigma = 7.5$

What percent of these mothers are between the ages of 32 to 40?

This is the pvalue of Z when X = 40 subtracted by the pvalue of Z when X = 32.

X = 40

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{40 - 35.5}{7.5}$

$Z = 0.6$

$Z = 0.6$ has a pvalue of 0.7257

X = 32

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{32 - 35.5}{7.5}$

$Z = -0.47$

$Z = -0.47$ has a pvalue of 0.3192

0.7257 - 0.3192 = 0.4065

40.65% of these mothers are between the ages of 32 to 40

What percent of these mothers are less than 30 years old?

This is the pvalue of Z when X = 30.

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{30 - 35.5}{7.5}$

$Z = -0.73$

$Z = -0.73$ has a pvalue of 0.2327

23.27% of these mothers are less than 30 years old

What percent of these mothers are more than 38 years old?

This is 1 subtracted by the pvalue of Z when X = 38.

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{38 - 35.5}{7.5}$

$Z = 0.33$

$Z = 0.33$ has a pvalue of 0.6293

1 - 0.6293 = 0.3707

37.07% of these mothers are more than 38 years old

5 0

3 years ago

The word pluralistic contains the root pour which means more what does pluralistic mean?

ollegr [7]

I tihink the answer is C

3 0

4 years ago

Read 2 more answers

Number 6-9 I don't know it

Bogdan [553]

This is not 4 different problems.
It's the same problem 4 times.

The Rule: To find the unit rate, divide the price by the quantity.
   Just like you wrote in pencil next to #6 and #8 .
_________________________________

#6). Look at The Rule up above.

   Unit price for Brand A: $4.80 / 32 oz = 15¢ per oz.
   Unit price for Brand B: $5.76 / 48 oz = 12¢ per oz.
   Unit price for Brand C: $17.92 / 128 oz = 14¢ per oz.

#7).
IF the price is the ONLY thing that's different about them, then Brand-B
is the best choice, because it's the lowest price per ounce.

BUT ... there may be other things to compare:
Do they all get your dishes equally clean ?
Do they all rinse off equally easily ?
Do they all smell the same ?
Do any of them attract bugs when they stand around ?
Do any of them spoil when they stand around open ?

You may want to consider other things besides the price
when you're deciding which detergent to buy.

#8). Look at The Rule up above again.

   Unit rate for Regular size = $3.36 / 16 oz = 21¢ per oz.
   Unit rate for Family size = $7.60 / 40 oz = 19¢ per oz.

<span>#9).
</span>Again ... IF the cost is the ONLY thing to think about, then the Family size
is the better buy, because it costs 2¢ less for every ounce.
But there may be other things to consider. Does the peanut butter from
both sizes taste the same ? Does one taste better ? Is the Family size
so big that it might be hard to handle, and you may drop it by accident ?

4 0

4 years ago