3 years ago

I need help please.

Mathematics

1 answer:

alexgriva [62]3 years ago

7 0

Solve for x by simplifying both sides of the equation, then isolating the variable.

Answer: X = -2

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Answer:

(a) σ² = 144

(b) s² = 12

Step-by-step explanation:

(a) Population variance σ² = ∑(X - $\overline{X}$ )² / N

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$\overline{X} = \frac{130}{5}$

$\overline{X} = 26$

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= $\frac{(- 18)^{2} + (- 9)^{2} + (3)^{2} + (9)^{2} + (15)^{2}}{5}$

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= $\frac{720}{4}$

σ² = 144

(b) $Standard\ deviation = \sqrt{Variance}$

$= \sqrt{144}$

= 12

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3 years ago

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