Woman using the Urinella, a type of female urination device, to adapt to standard men's room urinals. A female urination device, female urination aid, or stand-to-pee device (STP) is a device which aids a female to urinate while standing upright. Variations include basic disposable funnels to more elaborate reusable designs. Female urination devices have increased in popularity since the 1990s.
Each of the rectangles in the histogram has a base of 25, and the heights are 3, 7, 8, 10, 1, and 1. Thus the total area of the histogram is 3x25+7x25+8x25+10x25+1x25+1x25=750. We want the value with area 750/2=375 to the right of it and 375 to the left of it.
The class widths are therefore 6, 5 and 2. The area of a histogram represents the frequency. The areas of our bars should therefore be 6, 15 and 4. Remember that in a bar chart the height of the bar represents the frequency.It is therefore correct to label the vertical axis 'frequency'.he class widths are therefore 6, 5 and 2. The area of a histogram represents the frequency. The areas of our bars should therefore be 6, 15 and 4. Remember that in a bar chart the height of the bar represents the frequency.