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Elina [12.6K]
3 years ago
9

that one kilogram of rice weigh the same as 10 bags containing 100 grams of beans each do you agree with her why or why not

Mathematics
1 answer:
salantis [7]3 years ago
6 0
I agree because 1 kilogram equals 100 grams, and if all of the bags are counted together, it would equals 100 grams.
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The number of students in a chess club decreased from 17 to 10. What is
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  • 41.18%

Step-by-step explanation:

  • Initial number = 17
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<u>Decrease in number:</u>

  • 17 - 10 = 7

<u>Percent decrease:</u>

  • 7/17*100% = 41.18% (rounded)
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What is the following product in simplified form?
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The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident th
Oksana_A [137]

Answer:

The minimum sample size that should be taken is 62.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken

This is n when M = 1, \sigma = 4. So

M = z*\frac{\sigma}{\sqrt{n}}

1 = 1.96*\frac{4}{\sqrt{n}}

\sqrt{n} = 4*1.96

(\sqrt{n})^{2} = (4*1.96)^{2}

n = 61.5

The minimum sample size that should be taken is 62.

8 0
3 years ago
Solve for x.<br><br> 2/3(x−7)=−2
zaharov [31]
2/3x - 14/3 = -2
3(2/3x - 14/3) = -2(3)
           2x - 14 = -6
                   2x = -6 + 14
                   2x = 8
                     x = 8/2
                     x= 4

hope this helps :)



5 0
3 years ago
Read 2 more answers
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