One of the first recorded uses of statistics was in the $9$th century by an Arab Muslim philosopher, Al$-$Kindi. He was studying cryptanalysis, or codebreaking, and realized that the most frequently occurring letters in a cypher should correspond to the most frequently occurring letters in the alphabet.

In three to five sentences, with source$($s$)$ cited, determine and explain what the most frequently occurring letters are in the English alphabet $($and what their frequencies are$).$ Once you have that, use that information to explain how you would use it to try to break this code $($you do not have to actually break it$,$ but you can if you want$).$