According to Article 1 of the Constitution, how many representatives there are in Congress is determined by each state's population. A census is taken every 10 years to accurately apportion a state's representatives. The most basic calculation is there is to be one representative for every 30,000 residents. If there are not 30,000 people living in a state, that state will still get at least one representative.
Find the Class Width of the Frequency Table. The lower limit for every class is the smallest value in that class. On the other hand, the upper limit for every class is the greatest value in that class. The class width is the difference between the upper or lower class limits of consecutive classes. All classes should have the same class width. In this case, class width equals to the difference between the lower limits of the first two classes. Simplify to find that the class width is .
Measured width 210cm. x 2 for fullness = 420cm. divided by fabric width (137cm) = 3.07. You will then need to round this figure to the exact number it is closest to. In this example the figure is just over 3 so you would use 3 widths of fabric (one and a half in each curtain for a pair of curtains).If the figure was just below (eg 2.85) you would go up to 3.inally, multiply the length of fabric for each width by the number of widths you need to get the total amount of fabric you need. In our example this would be 195cm x 3 = 585cm or 5.85m of fabric needed.