Question

1. Suppose grades = [9, 7, 7, 10, 3, 9, 6, 6, 2]

Write in Python

1. An expression that evaluates to the number of 7 grades
2. A statement that changes the last grade to 4
3. An expression that evaluates to the maximum grade
4. A statement that sorts the list grades
5. An expression that evaluates to the average grade

Answer 1

Let us suppose the name of the list is "grades"

grades= [9,7,7,10,3,9,6,6,2]

a). grades.count(7)

b). grades[len(grades)-1]=4

c). max(grades)

d). grades.sort() # For ascending order

grades.sort(reverse=True) # For descending order

e). sum(grades) / len(grades)

Sample Output:

NOTE : The original output varies for questions d and e when you execute c,d and e separately without executing b.

Because, in b the original list is manipulated.