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Sedaia [141]
3 years ago
6

Someone please help me please please please

Mathematics
1 answer:
Semmy [17]3 years ago
6 0
1) A={3,5,7,9,11}            B={4,8,12},  and  A∪B ={3,4,7,8,9,11,12}

2) Normal distribution with Mean 80% & SD = 5%
The here below "distribution" is easy to figure out
                       

            --70%----------75%------------ 80%--------85%-----90%------
              -2σ            -1σ                   Mean         1σ          2σ
You should know for + or - 2σ the probability is 95%. Since here we are taking half of it will be 47.5%

For the last one I don't have the Z-Score Table. Sorry
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Answer:

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Step-by-step explanation:

In order to solve using elimination, multiply the top equation by -3 and then add the equations together.

-9x - 12y = -54

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Now that we have a value for y, we can put it into either equation and solve for x.

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Answer:

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