Michelle wants to determine the height of the flag pole outside of her school. She places a meter stick next to the flag pole an
d measures the shadow of the meter stick and the flag pole. If the meter stick has a shadow of 140 centimeters and the flag pole has a shadow of 35 meters, then how tall is the flag pole?
A.
25 meters
B.
12.5 meters
C.
250 meters
D.
400 meters
A.
25 meters
B.
12.5 meters
C.
250 meters
D.
400 meters
1 answer:
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Answer:
A 90% confidence interval for the mean number of letter sounds identified in one minute is: (30.84, 37.34).
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 .
That is z with a pvalue of , so Z = 1.645.
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 34.09 - 3.25 = 30.84.
The upper end of the interval is the sample mean added to M. So it is 34.09 + 3.25 = 37.34.
A 90% confidence interval for the mean number of letter sounds identified in one minute is: (30.84, 37.34).