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Alona [7]
3 years ago
5

I don't know how to solve systems by graphing. I've been skipping my homework because I have NO CLUE WHAT TO DO!!!!!

Mathematics
2 answers:
STALIN [3.7K]3 years ago
6 0
Don't just finish your worksheet and get your A
Slav-nsk [51]3 years ago
4 0
May I please ask,Where is the Mathematic problem that I may solve. ;)
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An art history professor assigns letter grades on a test according to the following scheme. A: Top 13% of scores B: Scores below
madam [21]

Answer:

The numerical limits for a B grade are 81 and 89, that is, a score between 81 and 89 gets a B grade.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Scores on the test are normally distributed with a mean of 79.7 and a standard deviation of 8.4.

This means that \mu = 79.7, \sigma = 8.4

B: Scores below the top 13% and above the bottom 56%

So between the 56th percentile and the 100 - 13 = 87th percentile.

56th percentile:

X when Z has a p-value of 0.56, so X when Z = 0.15. Then

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

0.15 = \frac{X - 79.7}{8.4}

X - 79.7 = 0.15*8.4

X = 81

87th percentile:

X when Z has a p-value of 0.87, so X when Z = 1.13.

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

1.13 = \frac{X - 79.7}{8.4}

X - 79.7 = 1.13*8.4

X = 89

The numerical limits for a B grade are 81 and 89, that is, a score between 81 and 89 gets a B grade.

4 0
2 years ago
Steve drove for 8 1/2 hours at 72 miles per hour. How much distance did he travel?
Pie

Answer:

He traveled 612 miles in total.

Step-by-step explanation:

You simply multiply the mph he was going to how long he traveled for. This gives us 72x8.5 equaling 612.

7 0
3 years ago
Read 2 more answers
Work out 25% of £18
konstantin123 [22]
It’s £4.5

Convert 25 to a decimal so 0.25

0.25 x 18 = 4.5
8 0
2 years ago
Read 2 more answers
SOME PLEASE HELP IM STRESSED OUT ILL GIVE OUT BRAINLIEST PLEASE DON’T ANSWER IF YOU DON’T KNOW
Cerrena [4.2K]

Answer:

7,042

Step-by-step explanation:

5 0
3 years ago
Enter an inequality that represents the description, and then solve.
kondaur [170]

Answer:

X > 9

Step-by-step explanation:

2x > 18

x > 18/2

x > 9

4 0
2 years ago
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