Write main() class that uses the DoubleList class:

1. Create new DoubleList with 10 slots.

2. Set the first five elements of the DoubleList to the grades of five of your term 1 courses. Use one statement.

3. Use a Scanner to get the remaining 5 grade values (enter the grades you think you'll get in 5 of your courses this term).

4. Display the average of all values in the DoubleList, and then display the standard deviation.