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Romashka-Z-Leto [24]
3 years ago
5

Guillermo earned $15.25 per hour for 25 hours of work. What was he paid?

Mathematics
2 answers:
JulsSmile [24]3 years ago
4 0

$381.25

you have to multiply $15.25 by 25

Dima020 [189]3 years ago
3 0

Answer:

$381.25

Step-by-step explanation:

15.25*25=381.25

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How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 95% confidence that
zimovet [89]

Answer:

61 commuters must be randomly selected to estimate the mean driving time of Chicago commuters.                

Step-by-step explanation:

Given : We want 95% confidence that the sample mean is within 3 minutes of the population mean, and the population standard deviation is known to be 12 minutes.

To find : How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?

Solution :

At 95% confidence the z-value is z=1.96

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Substitute the value in the formula,

3=\frac{12\times 1.96}{\sqrt{n}}

3=\frac{23.52}{\sqrt{n}}

\sqrt{n}=\frac{23.52}{3}

\sqrt{n}=7.84

Squaring both side,

n=61.4656

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