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Leviafan [203]
2 years ago
8

The standard deviation for a set of data is 7.5. The mean is 235. What is the margin of error?

Mathematics
2 answers:
blondinia [14]2 years ago
7 0

The margin of error is 0.97849

we are given

mean=235

so,

n=235

standard deviation =7.5

so,

\sigma=7.5

we know that

ME=2*standard error

and

SE=\frac{\sigma }{\sqrt{n} }

If confidence level is 95%, then we can multiply by 1.96

so, we can multiply by 2 to get ME

now, we can use marginal error formula

ME=\frac{2\sigma }{\sqrt{n} }

now, we can plug values

and we get

ME=\frac{2\times 7.5 }{\sqrt{235} }

ME=0.97849

oksian1 [2.3K]2 years ago
7 0

Answer:

The correct answer is 15

Step-by-step explanation:

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3 years ago
If you divide one of the roots of the equation 4x2+bx−27=0 by the other root, the quotient will be −3. Find b.
klio [65]
<h3>Answer:</h3>

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<h3>Explanation:</h3>

Suppose one root is <em>a</em>. Then the other root will be -3<em>a</em>. The product of the two roots is the ratio of the constant coefficient to the leading coefficient:

  (<em>a</em>)(-3<em>a</em>) = -27/4

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Then the other root is

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_____

<em>Check</em>

For b = 12, the equation factors as ...

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  It has roots -9/2 and +3/2, the ratio of which is -3.

For b = -12, the equation factors as ...

  4x² -12x -27 = (2x +3)(2x -9) = 0

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tia_tia [17]

Answer:

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Step-by-step explanation:

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