3 years ago

The mean points obtained in an aptitude examination is 111 points with a variance of 400.

1 answer:

4 0

Answer:

0.9128 = 91.28% probability that the mean of the sample would differ from the population mean by less than 2.8 points if 63 exams are sampled

Step-by-step explanation:

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Plz answer quickly <br> -3 = z - 8

kakasveta [241]

Answer:

Step-by-step explanation:

z = -3 + 8 = 5

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What is the simplest form of this expression<br>y (-2y - 6) - 54

dusya [7]

The simplest form of that expression is -2y^2-64-54

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Which of the following terms correctly describes the figure given below

lesya692 [45]

The correct answer is polyhedron

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4 years ago

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Rewrite the quadratic function in vertex form.<br> Y=3x^2-12x+4

chubhunter [2.5K]

Answer:

$\large\boxed{y=3(x-2)^2-8}$

Step-by-step explanation:

The vertex form of an equation of a parabola y = ax² + bx + c:

$f(x)=a(x-h)^2+k$

(h, k) - vertex

$h=\dfrac{-b}{2a},\ k=f(h)$

We have the equation:

$y=3x^2-12x+4\\\\a=3,\ b=-12,\ c=4$

Substitute:

$h=\dfrac{-(-12)}{2(3)}=\dfrac{12}{6}=2\\\\k=f(2)=3(2^2)-12(2)+4=3(4)-24+4=12-24+4=-8$

Finally:

$y=3(x-2)^2+(-8)=3(x-2)^2-8$

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3 years ago

Justin gave clerk $20 to pay a bill of $6.57. How much change should Justin get

hodyreva [135]

Well if he gave the clerk a $20 bill but paid $6.57 then the answer would be $13.43 because you will be subtracting $6.57 from $20

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