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.
Answer:
A=a+b
2h
Step-by-step explanation:
Just type in the sides you will get the answer, hope it helps
Hello,
P is the middle of [BB'] its coordinate is ( (2+2)/2 , (8+2)/2)=(2,5)
I hope this helps you
30 degree = k
60 degree = k square root of 3
90 degree = 2k
hypothenus =10 =>90 degree
one leg = 5 => 30 degree
Answer:
3 8/9
Step-by-step explanation:
How many times does 18 multiply to 70-
18 * 1 = 18
18 * 2 = 36
18 * 3 = 54
18 * 4 = 72
If we go past 3 times then it goes higher than 70, so 18 goes into 70 3 times.
18 * 3 = 54
70 - 54 = 16
The left over will be the numerator and the denominator stays the same.
Don’t forget to simplify-
16 / 2 = 8
18 / 2 = 9