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PtichkaEL [24]
3 years ago
12

The mean of 12 numbers is 20 and the mean of another 8 numbers is 25 find the mean of the 20 numbers

Mathematics
1 answer:
AysviL [449]3 years ago
8 0

Answer:

22

Step-by-step explanation:

mean is calculated as

mean = \frac{sum}{count}

Given the mean of 12 numbers is 20 , then

\frac{sum}{12} = 20 ( multiply both sides by 12 )

sum = 240

Given the mean of 8 numbers is 25 , then

\frac{sum}{8} = 25 ( multiply both sides by 8 )

sum = 200

Total sum of the 20 numbers = 240 + 200 = 440, then mean of 20 numbers is

mean = \frac{440}{20} = 22

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Answer:

x = y/12

Step-by-step explanation:

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3 years ago
Susan is going to watch a movie in her collection she has 5 action movies 4comedies and 3 dramas she will randomly select one mo
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Answer:

9/12 or 75%.

Step-by-step explanation:

Let's first add the choices all up.

5+4+3= 12.

We have 12 movie choices in total.

Now, we know that we have 3 drama movie choices...so the chance we will choose drama is 3/12, but we are not finding that.  We want the chance she will NOT choose drama, so that would be 9/12.

*Since the chance she will choose drama is 3/12, the chance she will not choose is 9/12. 9+3 is 12, the total amout.*

6 0
2 years ago
Find the x and y intercepts of the quadratic equation<br> f(x)=-x^2+4x-4
earnstyle [38]
<u>X - Intercept</u>
f(x) = -x² + 4x - 4
   0 = -x² + 4x - 4
   x = <u>-(4) +/- √((4)² - 4(-1)(-4))</u>
                         2(-1)
   x = <u>-4 +/- √(16 - 16)</u>
                    -2
   x = <u>-4 +/- √(0)
</u>               -2<u>
</u>   x = <u>-4 +/- 0
</u>              -2<u>
</u>   x = <u>-4 + 0</u>      x = <u>-4 - 0</u>  
            -2                 -2
   x = <u>-4</u>             x = <u>-4</u>
         -2                   -2
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The solution to the problem is {2, 2}, or {2}. The x - intercept of the problem is (2, 0).

<u>Y - Intercept</u>
f(x) = -x² + 4x - 4
f(x) = -(0)² + 4(0) - 4
f(x) = -(0) + 0 - 4
f(x) = -0 + 0 - 4
f(x) = 0 - 4
f(x) = -4

The y - intercept of the problem is (0, -4).
<u />
8 0
3 years ago
A dress regularly sells for $96. The sale price is $68. Find the percent decrease of the sale price from the regular price. Roun
yuradex [85]

Answer:

29.2 percent decrease

Step-by-step explanation:

the difference between 96 and 68 is 28 bucks

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coldgirl [10]
The slope of x-y=8 is 1 because it's actually y = x-8

Parallel means the slope is equal to 1 as well.
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