The box plot shows the ages of people at a movie screening. What percent of the people are between 20 and 37 years old?
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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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When dividing fractions these are the steps you will take:
1. The first number in the expression stays the same. If it is a whole number then you may just place a one in the denominator and keep the numerator as the whole number like so:
÷
2. Change the division sign into a multiplication sign
×
3. Take the reciprocal (switch the places of numerator and denominator) of the second number in the expression
×
4. Multiply across
^^^This can be further simplified:
4
Hope this helped!
~Just a girl in love with Shawn Mendes