3 years ago

Is (5, 4) a solution to this system of equations? 2x + 3y = 23 y + x = 9

Mathematics

1 answer:

lions [1.4K]3 years ago

6 0

No because it works for y + x= 9 but not the first one

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Answer:

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Step-by-step explanation:

Given

$Mean = 40$

$s^2 = 64$ ----- variance

$n = 16$ ------------ sample

Required

Determine the S.E

The estimated standard error (S.E) for the sample mean is calculated using the following formula:

$S.E = \frac{SD}{\sqrt n}$

Where

$SD = Standard\ Deviation$

$SD = \sqrt {s^2}$

$SD = \sqrt {64}$

$SD = 8$

So:

$S.E = \frac{SD}{\sqrt n}$

$S.E = \frac{8}{\sqrt{16}}$

$S.E = \frac{8}{4}$

$S.E = 2$

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