Answer:
system of equations:
Step-by-step explanation:
I've attached an image with an explanation below, hope it helps!
The cartesian coordinates of the point are (−1,3√). hence, polar coordinates of the point are
1 answer:
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Answer:
w = 9.6cm
Step-by-step explanation:
Similar Triangles
=
20*w = 16*12
w = = 9.6
w= 9.6 cm
Answer:
The 95% confidence interval estimate for the population mean life of compact fluorescent light bulbs in this shipment is between 7,255 hours and 7,745 hours.
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 the margin of error 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 7500 - 245 = 7255 hours.
The upper end of the interval is the sample mean added to M. So it is 7500 + 245 = 7745 hours.
The 95% confidence interval estimate for the population mean life of compact fluorescent light bulbs in this shipment is between 7,255 hours and 7,745 hours.