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).
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Answer:
x=5/2, x=-4/3
Step-by-step explanation:
Answer:
x = 55
Step-by-step explanation:

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Answer:
a² - 5a - 36
Step-by-step explanation:
(a - 9)(a + 4)
each term in the second factor is multiplied by each term in the first factor, that is
a(a + 4) - 9(a + 4) ← distribute parenthesis
= a² + 4a - 9a - 36 ← collect like terms
= a² - 5a - 36
Answer:
2g² + 10g
Step-by-step explanation:
Let the,
Length of the rectangle be " l ".
Base of the rectangle be " b ".
l = 2g
b = g + 5
Formula : -
Area of the rectangle = lb
Area of the rectangle
= 2g ( g + 5 )
= 2g ( g ) + 2g ( 5 )
= 2g² + 10g
Therefore,
the area of a rectangle whose sides measure 2g and ( g + 5 ) is 2g² + 10g.