What is the problem, if any, with the following code? The desired output is [3, 19]. >>> aList = [19,3]

>>> aList[0] = aList[1]

>>> aList[1] = aList[0]

>>> aList

a)You need to import list to use a list.

b)There is no problem.

c)You need parentheses around 0 and 1, as in aList(0) and aList(1).

d)You need a temporary variable to hold the value 3.

Which of these is most responsible for differences between the twentieth century to the twenty-first century?

The qwerty keyboard is the most common layout of keys on a keyboard

Write a grading program for a class with the following grading policies: a. there are two quizzes, each graded on the basis of 10 points. b. there is one midterm exam and one final exam, each graded on the basis of 100 points. c. the final exam counts for 50% of the grade, the midterm counts for 25%, and the two quizzes together count for a total of 25%. (do not forget to normalize the quiz scores. they should be converted to a percentage before they are averaged in.) any grade of 90 or more is an a, any grade of 80 or more (but less than 90) is a b, any grade of 70 or more (but less than 80) is a c, any grade of 60 or more (but less than 70) is a d, and any grade below 60 is an f. the program will read in the student’s scores and output the student’s record, which consists of two quiz and two exam scores as well as the student’s average numeric score for the entire course and final letter grade. define and use a structure for the student reco