3 years ago

15 PTS !! NEED ASAP HELP !!

Mathematics

1 answer:

zloy xaker [14]3 years ago

7 0

Answer:

314.16 m^2

Step-by-step explanation:

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Monte owned stock in Hadley Corporation which paid an annual dividend of $5.15 per share. If the closing price per share was $52

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3 years ago

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AVprozaik [17]

The discount is 50-14 = $36

% discount = (36/50)*100 = 72%

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what is the equation for A 450-gallon tank full of water is draining at a rate of 20 gallons per minute.

zhuklara [117]

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3 years ago

Find an equation for the line below

tia_tia [17]

Y=0.5x-0.5
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3 years ago

A recent survey based on a random sample of n=470 voters, predicted that independent candidate for the mayoral election will get

julsineya [31]

I have an expression

$\sigma = \sqrt{p(1-p)/n}$

floating around in my head; let's see if it makes sense.

The variance of binary valued random variable b that comes up 1 with probability p (so has mean p) is

$E( (b-p)^2 ) = (-p)^2(1-p) + (1-p)^2p = p(1-p)$

That's for an individual sample. For the observed average we divide by n, and for the standard deviation we take the square root:

$\sigma = \sqrt{p(1-p)/n}$

Plugging in the numbers,

$\sigma = \sqrt{.24(1-.24)/490} = 0.019 = 1.9\%$

One standard deviation of the average is almost 2% so a 27% outcome was 3/1.9 = 1.6 standard deviations from the mean, corresponding to a two sided probability of a bit bigger than 10% of happening by chance.

So this is borderline suspect; most surveys will include a two sigma margin of error, say plus or minus 4 percent here, and the results were within those bounds.

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4 years ago