Now letâs see what we get when we do the math. The mean of this new data set would be the sum of the values ($690,000) divided by the number of values (11). This gives you a mean or average salary for the accounting department of $62,727.
Forget Orville Wright and his brother Wilbur. Start thinking instead of Alberto Santos Dumont, the Brazilian pioneer aviator and the man who really invented the aeroplane. That is the attitude here in Brazil, as the country prepares to celebrate the centenary tomorrow of the world's first powered flight.
Things Took Off with Planes. Then, humans began to look at planes to make their dreams of flight come true. George Cayley is often considered to be the father of the airplane, and his work is considered the start of modern aeronautics. He is particular famous for following the scientific method in his observations and experiments in flight, and he defined the four forces that affect a flying vehicle: wait, lift, thrust, and drag.