Jacksonville is a city in the U.S state of Florida. The settlement in Cowford as earlier known began in the year 1791 and the city received its present name. in 1822 in honor of Andrew Jackson, the first military governor of the Florida Territory. In 1821, Florida became a territory of the United States. The city grew rapidly and was chosen by the voters to consolidate the city and county governments in 1968. Thus Jacksonville was made the largest city in land area in United States. It is now the county seat of Duval County.
First, you have to know a little about statistics. I assume that the grades are drawn from a normal (bell-curve) distribution. These distributions have an average (also called a mean) and a standard deviation (stdev), which measures how wide the distribution spreads out.
Dropping a class is much better for your GPA than failing a class or getting a C or D in it is because a dropped class does not affect your grade point average. Dropping a class may also raise your GPA because it can allow you to spend more time on other classes and raise your grades in them.