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2 years ago

9

The mean score on a physics test was 75 points. Amy’s score was 67 points, which was 2 standard deviations below the mean. What

is the variance of the data set? 2 4 8 16.

1 answer:

Norma-Jean [14]2 years ago

7 0

Answer:

Its 16

Step-by-step explanation:

i had the same question and this was the answer on the unit test

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What is the value of cos θ given that (-2, 9) is a point on the terminal side of θ?

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Answer:

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Step-by-step explanation:

<u><em> Step(i):</em></u>-

Given point ( x , y ) = ( - 2 , 3 )

We know that the polar co-ordinates

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$r = \sqrt{(-2)^{2} +(9)^{2} } = \sqrt{4+81} = \sqrt{85}$

<u><em>Step(ii)</em></u>:-

x = r cos θ

cosθ $= \frac{x}{r}$

cosθ = $\frac{-2}{\sqrt{85} } = \frac{-2}{\sqrt{85} } X \frac{\sqrt{85} }{\sqrt{85} }$

cosθ = $\frac{-2\sqrt{85} }{85}$

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