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stealth61 [152]
3 years ago
14

A student received a 75% on an exam. If there were 20 questions on the exam, which ratio would show the number of questions answ

ered correctly to the total number of questions? A. 5:20 B. 15:20 C. 20:15 D. 20:5
Mathematics
1 answer:
fredd [130]3 years ago
7 0

Answer:

15:20

Step-by-step explanation:

15:20 = 15/20 = .75 = 75%

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4 years ago
What is the rule for translating 4 units to the right
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Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir
Ksju [112]

Answer:

We need a sample size of at least 75.

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.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, we 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 the square root of the variance. So:

\sigma = \sqrt{484} = 22

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

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

5 = 1.96*\frac{22}{\sqrt{n}}

5\sqrt{n} = 43.12

\sqrt{n} = \frac{43.12}{5}

\sqrt{n} = 8.624

(\sqrt{n})^{2} = (8.624)^{2}

n = 74.4

We need a sample size of at least 75.

6 0
3 years ago
Read 2 more answers
Say that you (or your parents) are purchasing a used car for $19,850. The sales tax is 7.5%, the down payment is $1,000.00, and
IgorLugansk [536]
We are NOT told  1) the finance charge and 2) the amount of time
<span> <span> 19,850.00 <span> Car Price
+1,488.75 Sales Tax </span> <span>
</span><span> -1,000.00 Down Payment
</span> 20,338.75 </span> </span> This is the amount being financed

Using a loan calculator http://www.1728.org/calcloan.htm
We see that if the loan is for 9.382% and it is for 5 years,
Then the monthly payment is $425.98
We will make 60 (12 months * 5) monthly payments resulting in a total loan cost of 425.98 * 60 =
  <span> <span> 25,558.80 </span> </span> Total Loan Cost
-20,338.75  Money Being Financed

   5,220.05  Five Year's Interest
********************************************************************
THIS ISN'T EXACTLY RIGHT - SCROLL TO THE BOTTOM
So, 5,220.05 / 60 = Interest Paid each month.
= $87.00

So,
425.98
 -87.00
<span> <span> 338.98 </span> </span> Each month goes toward the principal.
******************************************************************************************
Although, the monthly payment remains exactly the same each month, the amount going toward interest and the amount going to equity (what you own), changes drastically each month.
See the mortgage calculator
http://www.1728.org/mortmnts.htm

So, your first payment, of 452.98 pays for $159.02 in interest and $266.95 in principal.


5 0
3 years ago
Read 2 more answers
Pls help me help my little cuz to understand pls BONUS POINTS!
aliya0001 [1]
Which part do you need help on?
7 0
3 years ago
Read 2 more answers
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