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2 years ago

Need help plz answer correctly Will mark brainlest

2 answers:

5 0

1. : 0.4 because 40/100=0.40 and the the last 0 doesn't mean anything so it get's taken away.

2. 4/5 because 0.8=8/10=4/5.

3. 8/25 because 0.32 = 32/100 = 8/25.

4. 35% because 0.35 • 100 = 35.

Hoped I helped! (BTW : These are all simplified.)

Lina20 [59]2 years ago

3 0

0.4%
4/5
8/25
35%

Hope this helps :3

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Answer:

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Step-by-step explanation:

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$W = \frac{X-\mu}{\sigma} = \frac{X-4.2}{0.4}$

We will use $\phi$ , the cummulative distribution function of W. The values of $\phi$ are well known and the can be found in the attached file

$P(4.2 < X < 4.9) = P(\frac{4.2-4.2}{0.4} < \frac{X-4.2}{0.4} < \frac{4.9-4.2}{0.4}) = P(0 < W < 1.75) = \\ \phi(1.75) - \phi(0) = 0.9599-0.5 = 0.4599$

We conclude that the probability that a call last between 4.2 and 4.9 minutes is 0.4599

Download pdf

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2 years ago

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Answer:

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Step-by-step explanation:

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Answer:

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