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3 years ago

53-_ =30 find missing number

Mathematics

2 answers:

Pavlova-9 [17]3 years ago

8 0

23 is the missing number

Alex787 [66]3 years ago

6 0

The correct answer is 23. Subtract 30 from 53, then check you answer by plugging in 23 in the equation and solving. Since it comes out to be 30, you know you are correct.

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3 years ago

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3 years ago

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3 years ago

A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Step 2 of 2 :

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Answer:

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Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

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Suppose a sample of 1067 floppy disks is drawn. Of these disks, 74 were defective.

This means that $n = 1067, \pi = \frac{74}{1067} = 0.069$

80% confidence level

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The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.069 + 1.28\sqrt{\frac{0.069*0.931}{1067}} = 0.079$

The 80% confidence interval for the population proportion of disks which are defective is (0.059, 0.079).

7 0

3 years ago