24. The clearness index was determined for the skies over Baghdad for each of the 365 days during a particular year ( Contribution to the Study of the Solar Radiation Climate of the Baghdad Environment, Solar Energy, 1990: 7—12). The accompanying table gives the results.

a. Determine relative frequencies and draw the corresponding histogram.

b. Cloudy days are those with a clearness index smaller than .35. What percentage of the days were cloudy?

c. Clear days are those for which the index is at least .65. What percentage of the days were clear?