Residents in a city are charged for water usage every three months. The water bill is computed from a common fee, along with the amount of water the customers use. The last water bills for 40 neighborhood residents are displayed in the histogram below.

A histogram titled Neighborhood Monthly water bill has monthly water bill (dollars) on the x-axis and frequency on the y-axis. 100 to 125, 1; 125 to 150, 2; 150 to 175, 5; 175 to 200, 10; 200 to 225, 13; 225 to 250, 8.

Which interval contains the median water bill?

$150–$175
$175–$200
$200–$225
$225–$250

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The interval which contains the median water bill is $200 - $225

The tabulated data :

Class interval ____ Frequency ___ Cummulative frequency

100 to 125, ________ 1 ___________ 1

125 to 150, 2 ______ 2 ___________3

150 to 175, 5 _______5 ___________8

175 to 200, 10 ______10 __________18

200 to 225, 13 _____13 __________ 31

225 to 250, _______ 8 __________40

The median class = Cummulative frequency / 2

The median class = 40 / 2

The class interval which contains the 20th frequency.

This is the 200 - 225 class

The interval which contains the median water bill is $200 - $225

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Answer:175-200

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