I learned how to create bar graphs on Weibull Histogram of Observed Maximum Winds by using Relative Frequency table on my own. I have used the number of wind speed values from column # 7 on tropical cyclones passing within 75 n mi of San Juan, Puerto Rico. I created a relative frequency table for annual percentages of maximum wind speeds. The annual percentage of wind speed formula is annual percentage of wind speed = number of wind speed values/total number of wind speed values. e.g. the wind speed interval is 34-43 knots, there are 14 values, so I divide 14 by 43 i.e. 32.56%, the answer is 32.56 percent of all 34-43 knot wind speeds. This graph is called Exponential graph.