The confidence interval for the mean usage of water is (18.7,20.5).
Given population standard deviation of 2.4, mean of 19.5 gallons per day and confidence interval of 98%.
We have to find the confidence interval for the mean usage of water.
To find out the confidence interval we have to first find margin of error.
μ=19.5
σ=2.4
α=0.98
α/2=0.49
We have to find the z value for the p value 0.49 which is z=2.33
Margin of error=z*μ/
=2.33*19.5/
=0.82
lower level=mean -m
=19.5-0.82
=18.68
after rounding upto 1 decimal
=18.7
upper mean = mean+m
=19.5+0.82
=20.52
Hence the confidence interval for the usage of water is (18.7,20.52).
Learn more about margin of error at brainly.com/question/10218601
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Answer:
$25.
Step-by-step explanation:
Let x be the original price of shorts.
We have been given that a store is having a sale in which all items are reduced 20%. The sales tax is 5%.
The price of shorts after 20% off will be:
Since tax is added after the discount, so the price of shorts after including the tax will be:
We are told that including tax, Jennifer paid $21 for a pair of shorts. So we can set an equation as:
Now let us solve for x.
Therefore, the original price of shorts was $25.
Answer:
X/Y
Step-by-step explanation:
You cannot divide two variables so you just leave it as a fraction
Answer:
A=314.2
Step-by-step explanation:
A=
r²
A=100
A=314.159
A=314.2
Answer:
-1 -1 1/2 -1/2 0 1 1/2 1 1/2
Step-by-step explanation:
I think this is right sorry if im wrong
