3 years ago

MISLEADING GRAPHS PLZ HELP!!!!! 25 POINTS!

Mathematics

1 answer:

IgorLugansk [536]3 years ago

5 0

I don’t get it sorry

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If a 12-student class averaged 90 on a test, and a 20-student class averaged 80 on the test, then all 32 students averaged

Alexxx [7]

Let the marks of the students in class 1 be

$m_1, m_2, ....., m_1_2$

the average of these 12 marks is 90, so

$\frac{m_1+ m_2+ .....+ m_1_2}{12}=90$

which means

$m_1+ m_2+ .....+ m_1_2=90*12=1080$

similarly, let $n_1, n_2, ....., n_2_0$ be the marks of the students in the second class,

so $\frac{n_1+ n_2+ ..... n_2_0}{20}=80$

which means $n_1+ n_2+ ..... n_2_0=80*20=1600$

The 32 students averaged:

$\frac{(m_1+ m_2+ .....+ m_1_2)+(n_1+ n_2+ ..... n_2_0)}{12+20}= \frac{1080+1600}{32}= \frac{2680}{32}= 83.75$

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4 years ago

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gregori [183]

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i think its y = x² + 6x - 55

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one linear expression is subtracted from a second linear expression and the difference is x-5. When is the difference when the s

sineoko [7]

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