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tatyana61 [14]
3 years ago
7

Someone help me with this

Mathematics
2 answers:
lisov135 [29]3 years ago
6 0
I think it foing ti be 4x cuz th
sveta [45]3 years ago
4 0
Ok so (4x-12) first yu want to get x by itself to get the answer so divide by 4 in both side so you could cancel out the 4. And then you would have to do 12 divided by 4 which is 3 so x=3
Hope this helped.
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How to find standard deviation from percentile for normal distribution?
QveST [7]
The standard deviation of what?  Percentiles from any normal distribution look the same, just like the unit normal, so you can't really determine the standard deviation of the original scores. You can determine a z score from a percentile.  That tells us the number of standard deviations, positive or negative, a given score is away from the mean score.  It's a normalized test result.

Your percentile is (a hundred times) the probability that another score is less than your score.  We have a normal distribution, so that probability is the integral of the standard normal from negative infinity to our normalized score.  

Let's call the percentile rank p, already scaled between zero and 1.

p=.5 corresponds to a z score z=0 because the fiftieth percentile means we got an exactly average score, 0 standard deviations away from the mean.

We know 68% of the probability will be between -1 and +1 standard deviation.  So z=-1 corresponds to p=.5-.68/2=.16 and
z=1 corresponds to p=.5+.68/2=.84

Similarly, 95% of the probability will be between -2 and +2 standard deviations.  So z=-2 corresponds to p=.5-.95/2=.025 and
z=2 corresponds to p=.5+.95/2=.975

That's about the list I can do off the top of my head. I think three standard deviations is 99.7%. For the rest we just consult a z table or integrated normal table.  We find p in the body of the table (maybe |.5-p| depending on the table) and then the column headings tell us our z score.

In this modern age, your computer can do this for you quickly

8 0
3 years ago
I cant delete this, how do I?
miss Akunina [59]

Answer:

u cant u got to make a new one

Step-by-step explanation:

4 0
3 years ago
Find the sum which amounts to Rs 9261 at 10% per annum compound interest for 18 months ,interest payable half yearly
AleksAgata [21]

Find the sum which amounts to Rs 9261 at 10% per annum compound interest for 18 months ,interest payable half yearly

A=P(1+\frac{r}{n})^{nt} , where A is amount , r is rate =10% = 0.10 , n is intervals of compounding n=2 , t is time = 18 months=1.5 years

Lets plug in

9261=P(1+\frac{0.10}{2})^{2*1.5}

9261 = P(1.002)^{3}

9261 = P(1.006012008)

divide both sides by 1.006012008

P= Rs 9205.6555

6 0
3 years ago
A group of randomly selected members of The Foodies Food Club were asked to pick their favorite type of food. The bar graph belo
Reptile [31]

Answer:(choice b) b: 98

Step-by-step explanation:

4 0
3 years ago
write an equation to find the number of students in mr.boggs homeroom if the total number of stdents is 90
prohojiy [21]

The number of students in Mr. Boggs’s homeroom is equal to b. Add the total number of students in each class and set it equal to 90.

90 = b + 1.5(b + 2) + 15 + (2b – 9)

Use the Distributive Property, and collect like terms. 90 = b + 1.5b + 3 + 15 + 2b – 9

90 = 4.5b + 9

4 0
2 years ago
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