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s2008m [1.1K]
3 years ago
10

Oliver raised his grade from an 85 to a 92 for the semester. What was the percent increase of his grade? A) .07% B) .08% C) 7% D

) 8%
Mathematics
2 answers:
Darya [45]3 years ago
7 0

(new - original)/original

(92-85)/85

7/85

.0823

8.23 %

Choice D


masha68 [24]3 years ago
6 0

D) 8%

92-85=7

7/85 = 0.08

0.08 X 100 = 8

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A normal distribution curve, where x = 70 and σ = 15, was created by a teacher using her students’ grades. What information abou
alexira [117]

The <em><u>correct answer</u></em> is:

We can conclude that 68% of the scores were between 55 and 85; 95% of the scores were between 40 and 100; and 99.7% of the scores were between 25 and 100.

Explanation:

The empirical rule tells us that in a normal curve, 68% of data lie within 1 standard deviation of the mean; 95% of data lie within 2 standard deviations of the mean; and 99.7% of data lie within 3 standard deviations of the mean.

The mean is 70 and the standard deviation is 15. This means 1 standard deviation below the mean is 70-15 = 55 and one standard deviation above the mean is 70+15 = 85. 68% of data will fall between these two scores.

2 standard deviations below the mean is 70-15(2) = 40 and two standard deviations above the mean is 70+15(2) = 100. 95% of data will fall between these two scores.

3 standard deviations below the mean is 70-15(3) = 25 and three standard deviations above the mean is 70+15(3) = 115. However, a student cannot score above 100%; this means 99.7% of data fall between 25 and 100.

4 0
3 years ago
Read 2 more answers
A construction worker drops a hammer while building the Grand Canyon skywalk 4,000ft above the Colorado River. Use the formula t
yan [13]

Answer:

15.8

Step-by-step explanation:

We are asked to find how many seconds it takes for an object to fall from a height of 4,000ft. We will use the given formula, t=h−−√4. Substituting h=4,000, we find

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7 0
2 years ago
Explain how to use the combine place values strategy to find 223-119
Vikentia [17]
So, the subtraction looks like this:

   223
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The reason why combining place values here is necessary is that 3 is less than 9 (so I can't just substract in the one's place without going to negative numbers)

so we combine the ones and tens places and substract the whole: 23-19 is four!
   223
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and then we continue
   223
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and that's the result!

3 0
2 years ago
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Lelechka [254]

Answer:

- 1/2

Step-by-step explanation:

y2 - y1 / x2 - x1

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4 0
3 years ago
How to evaluate this f (x) = -x^+1 for x =-3
sukhopar [10]
Just plug in -3 for x. So it will be -(-3)^+ 1
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I'm confused by your ^ sign I'm not sure if this is supposed to be squared or not...? But just solve/simplify the equation.
Hope this helps!
4 0
3 years ago
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