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3 years ago

Can anyone help me with the explanation and the work for the second one?

Mathematics

1 answer:

allochka39001 [22]3 years ago

5 0

Answer:

I would put that it is a unit rate problem because for every certain amount of flour there is a certain amount of salt

Step-by-step explanation:

And I would just draw that out and if you actually have to answer how many cups of salt than just draw the table like you did on #1

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The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people.

NISA [10]

Answer:

$8.2-2.58\frac{2.2}{\sqrt{18}}=6.86$

$8.2+2.58\frac{2.2}{\sqrt{18}}=9.54$

So on this case the 90% confidence interval would be given by (6.86;9.54) And the error is given by:

$ME= 2.58\frac{2.2}{\sqrt{18}} =1.338$

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".

$\bar X=8.2$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=2.2$ represent the population standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that $z_{\alpha/2}=2.58$

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

$8.2-2.58\frac{2.2}{\sqrt{18}}=6.86$

$8.2+2.58\frac{2.2}{\sqrt{18}}=9.54$

So on this case the 90% confidence interval would be given by (6.86;9.54) And the error is given by:

$ME= 2.58\frac{2.2}{\sqrt{18}} =1.338$

8 0

3 years ago

Read 2 more answers

A person breaths 20 times per minute how many times do they breath in 25 minutes

Sever21 [200]

Answer:

500 times

Step-by-step explanation:

They breathe 20 times per minute for 25 minutes

20(times per minute) x 25(minutes) = 500

3 0

2 years ago

Help please! There are 3 items in an order. They cost $8.95, $11.49, and $12.75. The sales tax for this order is 6.5%.

vredina [299]

Answer: $35.35

Step-by-step explanation:

Facts

3 items

item 1: 8.95

item 2: 11.49

item 3: 12.75

6.5% sales tax

Step 1: Find the total cost of the items ,before tax

8.95+11.49+12.75= 33.19

Step 2: Apply the sales tax

6.5% of 33.19 = 2.15735 --> approximatley $2.16

Step 3: Add the sales tax amount to the total cost of the items to find the final total cost.

$33.19+$2.16= $35.35

Hence the answer is B

Hope this helps !! :)) And brainliest would be appreciated

3 0

2 years ago

Read 2 more answers

Point B(6, -3) is translated using the rule (x -5 y + 9) what is the y coordinate of B'

Andrej [43]

This rule shows how we transition the x-coordinate and y-coordinate when finding B'.

In this rule, it shows us what to add/subtract from the x-value and y-value in the coordinate. We can see that it wants us to subtract 5 from the x-value (based on the "x - 5") and that it wants us to add 9 to the y-value (based on the "y + 9"). Based on this information, we can find B':

$\textrm{B}'(6 - 5, -3 + 9)$

$\boxed{\textrm{B}\,'(1, 6)}$

The "y-coordinate" of B' is 6.

7 0

3 years ago

Simplify your expression 3.7-5.3n-4n+5 can somebody help?

ArbitrLikvidat [17]

Answer:

-9.3n + 8.7

Step-by-step explanation:

5 0

3 years ago