Step-by-step explanation:
AB+BC=AC
so
AB=2X=2*3=6
BC=3x-1=9-1=8
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Answer:
2, 6, 11
Step-by-step explanation:
To evaluate f(- 1) substitute x = - 1 into f(x)
f(- 1) = 2(- 1)³ - 3(- 1)² + 7 = 2(- 1) - 3(1) + 7 = - 2 - 3 + 7 = 2
Similarly
f(1) = 2(1)³ - 3(1)² + 7 = 2(1) - 3(1) + 7 = 2 - 3 + 7 = 6
f(2) = 2(2)³ - 3(2)² + 7 = 2(8) - 3(4) + 7 = 16 - 12 + 7 = 11
X over 490 = 0.5% over 100
Answer:
The 95% confidence interval estimate of the population mean is between 5.51 and 8.51 years. This means that we are 95% sure that the true mean time that car owners plan to keep their cars is between 5.51 and 8.51 years.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 7.01 - 1.50 = 5.51 years.
The upper end of the interval is the sample mean added to M. So it is 7.01 + 1.50 = 8.51 years.
The 95% confidence interval estimate of the population mean is between 5.51 and 8.51 years. This means that we are 95% that the true mean time that car owners plan to keep their cars is between 5.51 and 8.51 years.