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IRISSAK [1]
3 years ago
11

Ten subtracted from a number if the difference is 30 what was the orginal number​

Mathematics
1 answer:
nadezda [96]3 years ago
5 0
X-10=30

X=30+10

X= 40

So the original number was 40 and you can prove it by subtracting 10 so 40-10= 30
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A quality control technician works in a factory that produces computer monitors. Each day, she randomly selects monitors and tes
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Answer:

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Step-by-step explanation:

We are given the following in the question:

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First, we design the null and the alternate hypothesis  

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This is a one-tailed(right) test.  

Formula:

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z = \dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}

Putting the values, we get,

z = \displaystyle\frac{0.08-0.05}{\sqrt{\frac{0.05(1-0.05)}{300}}} = 2.384

Now, we calculate the p-value from excel.

P-value = 0.00856

Since the p-value is smaller than the significance level, we fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.

Conclusion:

Thus, there is enough evidence to support the claim that the true proportion of monitors with dead pixels is greater than 5%.

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