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gladu [14]
2 years ago
5

. A 2% solution of acid was mixed with a 12%

Mathematics
1 answer:
IgorC [24]2 years ago
4 0
Sorry don’t now the answer to this problem
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An English professor assigns letter grades on a test according to the following scheme. A: Top 15% of scores B: Scores below the
lisabon 2012 [21]

Answer:

59 to 66

Step-by-step explanation:

Mean test scores = u = 74.2

Standard Deviation = \sigma = 9.6

According to the given data, following is the range of grades:

Grade A: 85% to 100%

Grade B: 55% to 85%

Grade C: 19% to 55%

Grade D: 6% to 19%

Grade F: 0% to 6%

So, the grade D will be given to the students from 6% to 19% scores. We can convert these percentages to numerical limits using the z scores. First we need to to identify the corresponding z scores of these limits.

6% to 19% in decimal form would be 0.06 to 0.19. Corresponding z score for  0.06 is -1.56 and that for 0.19 is -0.88 (From the z table)

The formula for z score is:

z=\frac{x-u}{\sigma}

For z = -1.56, we get:

-1.56=\frac{x-74.2}{9.6}\\\\ x = 59

For z = -0.88, we get:

-0.88=\frac{x-74.2}{9.6}\\\\ x = 66

Therefore, a numerical limits for a D grade would be from 59 to 66 (rounded to nearest whole numbers)

7 0
3 years ago
Need help asp pleaseeeeeeee
riadik2000 [5.3K]

Answer:

x=4

Step-by-step explanation:

You can use the app photo math, thats what I did you just take a pic of the problem and it shows you the steps and answer

7 0
2 years ago
Read 2 more answers
Your bank statement indicates that you are overdrawn on your checking account by $250. How much must you deposit to bring the ch
andrey2020 [161]

Answer:

you would have to deposit $432.

Step-by-step explanation:

it's actually pretty simple. all you have to do is add 182+250 which equals 432. if you want to check your work, add 432 to -250 and you should get 182.

3 0
3 years ago
What is the value of the power?
Salsk061 [2.6K]

Answer:

Exponet of 2

Step-by-step explanation:

because i know trust me its right

3 0
3 years ago
Using the graph as your guide, complete the following statement.
iogann1982 [59]

Answer:

Step-by-step explanation:

The discriminant tells you where the graph of the parabola goes through the x-axis, if at all. If the discriminant is negative there are no real zeros and the parabola does not cross or touch the x-axis; if the discriminant is positive the parabola will go through the x axis in 2 places; if the discriminant is 0 the parabola will touch the x-axis in 1 place. Our discriminant is 0 since the parabola only touches the x-axis but does not go through.

8 0
2 years ago
Read 2 more answers
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