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o-na [289]
3 years ago
11

The sodium content of twenty 300-gram boxes of organic cornflakes was determined. The data (in milligrams) are as follows: 131.1

5, 130.69, 130.91, 129.54, 129.64, 128.77, 130.72, 128.33, 128.24, 129.65, 130.14, 129.29, 128.71, 129.00, 129.39, 130.42, 129.53, 130.12, 129.78, 130.92 In this question, we want to verify whether the true mean sodium content of this brand of cornflakes differs from 130 milligrams under the significance level, a = 0.05.
Chemistry
1 answer:
Elena L [17]3 years ago
6 0

Answer:

The content of the brand actually differs from the expected average with the specified significance.

Explanation:

Hello,

By considering the given data, the average is computed via the addition of all the data divided by the sample's size:

m_{Na}=\frac{sum(m_i)}{20}

m_{Na}=\frac{2594.94mg}{20} =129.747mg

Now, that result, based on the significance, is compared with the following result:

130-0.05=129.95mg

Since the computed average is less than the previous result containing the significance, one states that the content of the brand actually differs from the expected average with the specified significance.

Best regards.

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Anastaziya [24]

Answer : The percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

Explanation :

First we have to calculate the number of atoms in 5.5 wt% Pb and 94.5 wt% of Sn.

As, 207.2 g of lead contains 6.022\times 10^{23} atoms

So, 5.5 g of lead contains \frac{5.5}{207.2}\times 6.022\times 10^{23}=1.59\times 10^{22} atoms

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As, 118.71 g of lead contains 6.022\times 10^{23} atoms

So, 94.5 g of lead contains \frac{94.5}{118.71}\times 6.022\times 10^{23}=4.79\times 10^{23} atoms

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\% \text{Composition of Pb}=\frac{\text{Atoms of Pb}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100

\% \text{Composition of Pb}=\frac{1.59\times 10^{22}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=3.21\%

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\% \text{Composition of Sn}=\frac{\text{Atoms of Sn}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100

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Thus, the percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

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