3 years ago

13. I think it is miles

Mathematics

1 answer:

babymother [125]3 years ago

7 0

Answer:

I think it would be miles.

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Solve for x: one over eight (8x + 15) = 24

Vsevolod [243]

The answer is 177/8 or one hundred seventy seven over eigth.

1/8(8x + 15) = 24

Multiply both sides by 8:
8* 1/8(8x + 15) = 8 * 24
8x + 15 = 192

Subtract 15 from both sides:
8x +15 - 15 = 192 - 15
8x = 177

Divide both sides by 8:
8x/8 = 177/8
x = 177/8

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The burning time of a very large candle is normally distributed with mean of 2500 hours and standard deviation of 20 hours. Find

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Answer: C.-1.5

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Given: The burning time of a very large candle is normally distributed with mean $(\mu)$ of 2500 hours and standard deviation $(\sigma)$ of 20 hours.

Let X be a random variable that represent the burning time of a very large candle.

Formula: $Z=\dfrac{X-\mu}{\sigma}$

For X = 2470

$Z=\dfrac{2470-2500}{20}\\\\\Rightarrow\ Z=\dfrac{-30}{20}\\\\\Rightarrow\ Z=\dfrac{-3}{2}\\\\\Rightarrow\ Z=-1.5$

So, the z-score they corresponds to a lifespan of 2470 hours. =-1.5

Hence, the correct option is C.-1.5.

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