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mote1985 [20]
3 years ago
8

The mean of 4 test scores is 90. What is the sum of the scores?

Mathematics
2 answers:
ollegr [7]3 years ago
6 0
To find a mean of a number or the average  you first would add all the test scores up. then divide by the number of the quantity there are.
* the quantity is 4
so before you divide by the quantity you already added the sum of the test so if you do the problem backward and instead of dividing by 4 you would multiply by 4. 

So 90 times 4 which is 360.
Thus the sum of the score is 360.
shepuryov [24]3 years ago
5 0
360. 
A general rule of thumb when dealing with questions like these is using the following equation:

(number of numbers) x (mean) = sum of numbers

Proof/Example: 7, 10, 13
There are 3 numbers here and the mean is 10. Multiply them together and you will get 30, just as you will get 30 from adding them together. 

In this case, there are 4 numbers and the mean is 90, so 4 x 90 = 360.
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Find the height of a cone with volume 4034.66 cm^3 and radius 13 cm.
pav-90 [236]
Volume of cone=4034.66cm^3
Pi×r^2×h/3=4034.66
Pi×13×13×h=4034.66×3
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h=4034.66×3×7/13×13×22
h=45.57
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8 0
3 years ago
A patrolman spends 25% every day completing paperwork. The patrolman’s shift each day is 8 hours. How much of his time does he s
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8 \times 25\% \\  = 8 \times  \dfrac{25}{100}  \\  = 2

Answer : He spends 2 hours doing paperwork each day.

Hope this helps. - M
4 0
3 years ago
Consider a parabola P that is congruent to y=x^2, opens upward, and has vertex (0,0). Find the equation of a new parabola that r
slega [8]

9514 1404 393

Answer:

  y = -(x+1)^2 +3

Step-by-step explanation:

Translating f(x) left by 1 unit replaces x with x+1.

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Reflecting f(x) over the x-axis replaces f(x) with -f(x).

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When y = x^2 is reflected over the x-axis, it becomes ...

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When y = -x^2 is translated 1 unit left, it becomes ...

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7 0
2 years ago
Thank you for the help!
horrorfan [7]

Answer:

see explanation

Step-by-step explanation:

cosM = \frac{adjacent}{hypotenuse} = \frac{MN}{LM} = \frac{8}{17}

sinM = \frac{opposite}{hypotenuse} = \frac{LN}{LM} = \frac{15}{17}

tanM = \frac{opposite}{adjacent} = \frac{LN}{MN} = \frac{15}{8}

7 0
2 years ago
Robert is selling his bulldozer at a heavy equipment auction. The auction company receives a commission of 5% of the selling pri
kifflom [539]

Answer:

$131422

Step-by-step explanation:

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Let :

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Sale price = amount owed + 5% of sale price

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x - 0.05x = 124850

0.95x = 124850

x = 124850 / 0.95

x = 131421.05263

To the nearest dollar = $131422

4 0
3 years ago
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