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Sauron [17]
3 years ago
14

X-21. Simplify the given rational expression:x2-4​

Mathematics
1 answer:
castortr0y [4]3 years ago
3 0
X^2-4 = x^2 - 2^2
= (x+2)(x-2)
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Answer: The point estimate of the population mean is <u>25</u>.

The margin of error for the confidence interval is <u>3</u> .

Step-by-step explanation:

The confidence interval for population mean is given by :-

(\overline{x}-E , \overline{x}+E) , here \overline{x} is the point estimate of the population mean and E is the margin of error .

As per given , we have

Lower bound of CI = \overline{x}-E =22   (1)

Upper bound of CI =  \overline{x}+E =28  (2)

Add (1) and (2) , we get

2\overline{x}=50\\\Rightarrow\ \overline{x}=25

Subtract (1) from (2) , we get

2E=6\\\Rightarrow\ E=3

Hence, the point estimate of the population mean is <u>25</u>.

The margin of error for the confidence interval is <u>3</u> .

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