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3 years ago

3x+21 =6x-60 What is x?

Mathematics

2 answers:

MaRussiya [10]3 years ago

7 0

X = 27
Explaination: That’s the answer

vodomira [7]3 years ago

3 0

3x+21=6x-60
+60. +60
3x+81=6x
-3x. -3x
81=3x
/3. /3
27=x

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A simple random sample of 60 items resulted in a sample mean of 65. The population standard deviation is 14. a. Compute the 95%

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The 95% confidence interval for the population mean is between 61.5 and 68.5.

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$\alpha = \frac{1-0.95}{2} = 0.025$

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 $1-0.025 = 0.975$ , so $z = 1.96$

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The upper end of the interval is the sample mean added to M. So it is 65 + 3.5 = 68.5

The 95% confidence interval for the population mean is between 61.5 and 68.5.

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