Why is a year not a whole number

In august 2012, tropical storm isaac formed in the caribbean and was headed for the gulf of mexico. there was an initial probability of .69 that isaac would become a hurricane by the time it reached the gulf of mexico (national hurricane center website, august 21, 2012). what was the probability that isaac would not become a hurricane but remain a tropical storm when it reached the gulf of mexico?

If a population is growing quickly in a small area then what must increase as well

Which measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air