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garik1379 [7]
3 years ago
13

The radius is 9 in.what is the area

Mathematics
1 answer:
Yuliya22 [10]3 years ago
3 0

Answer:

254.47

Step-by-step explanation:

Area= r²π

A= 9²π

A= 81π

A= 524.47

<u>NB</u>: this is a pi sign (π)

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A number cube with faces labeled from 1 to 6 was rolled 20 times. Each time the number
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Answer:

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Step-by-step explanation:

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The probability to obtain a certain number when throwing the dice is given by

p(x_i)=\frac{f_i}{\sum f}

where

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\sum f is the sum of the relative frequencies

Here the sum of the frequencies is:

\sum f=0+3+3+6+3+5=20

For number 5 here, we have:

f_5 = 3 (from the table)

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f_6=5

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p(6)=\frac{5}{20}

So the probability to obtain either a 5 or a 6 in the next rolling is:

p(5\cup 6)=p(5)+p(6)=\frac{3}{20}+\frac{5}{20}=\frac{8}{20}=0.4

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Let the planned number of parts per hour = x 
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