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Ray Of Light [21]
3 years ago
11

Donnell practiced the piano 3 hours longer than Marcus.

Mathematics
1 answer:
emmasim [6.3K]3 years ago
5 0
Donnell practiced 7 hours while Marcus practiced 4 hours.
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Given h(x)=-x+2, find h(2)
Bingel [31]

Answer:

0

Step-by-step explanation:

Replace x with 2.

-(2)+2=0

6 0
2 years ago
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Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 12. Use the empirical rule t
MissTica

Answer:

A) 99.7% of people have an IQ between 64 and 136.

B) 5% of people have an IQ score less than 76 or greater than 124.

C) 16% of people have an IQ score greater than 112.

Step-by-step explanation:

The Empirical Rule tells us that, in a normal or 'bell-shaped' distribution, 68% of the data is one standard deviation from the mean, 95% of the data is two standard deviations from the mean, and 99.7% of the data is three standard deviations from the mean.

A) 64 and 136 are 3 standard deviations away from the mean, so 99.7% of people have an IQ between 64 and 136.

B) 76 and 124 are 2 standard devations away from the mean, but the answer is asking what percentage is not between them. 100% - 95% gives us 5%.

C) 112 is one standard deviation away from the mean. If we want to find the percentage greater, then we can do 100% - 50% (as 112 is to the left of the mean), then we can take half of 68 to get 34%, and after subtracting 50% and 34% from the 100%, we get 16%.

8 0
3 years ago
CAN SOMEONE PLEASE LOOK AT MY LAST QUESTION AND SEE IF ITS RIGHT PLEASE?!
daser333 [38]

Answer:

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Step-by-step explanation:

5 0
3 years ago
111111111111111111111111111111111111111111111111111
Illusion [34]

Answer:

x = 4

Step-by-step explanation:

Step 1: Subtract 4 from both sides.

5x+4−4=24−4

5x=20

Step 2: Divide both sides by 5.

5x

5

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5

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you welcome love

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3 years ago
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48 units! This may be wrong but hoped it helped!

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3 years ago
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