$2\mathrm{.}4$ Map Scores to Grades

For all further problems please use the dictionary averages listed below:

averages $=\{$ "Alice": $84\mathrm{.}33,$ "Bob": $83\mathrm{.}33,$ "Charlie": $83\mathrm{.}33,$ "David": $97\mathrm{.}67\}$

Write a function map$\_$scores$\_$to$\_$grades that maps each student$$s average score to a letter grade $($A$,$ B$,$ C$,$ D$,$ or F$).$ Use the map$()$ function with a lambda function.

Grading system:

$90$ and above: A

$80$ to $89$: B

$70$ to $79$: C

$60$ to $69$: D

Below $60$: F

Hint: The map$()$ function applies a given function to all items in the list or dictionary.

Use a lambda function inside map$()$ to convert each student$$s average into a letter grade.

To apply the map$()$ function to a dictionary, you can use averages.items$()$ to get key$-$value pairs $($student$,$ average$).$

def map$\_$scores$\_$to$\_$grades$($averages$)$:

# Add your code here