Final answer:
The question involves using frequency analysis in cryptography to find a decryption key by comparing ciphertext letter frequencies with standard English letter frequency order.
Step-by-step explanation:
The subject of this question is frequency analysis used in cryptography, which falls under Computers and Technology, especially in the context of high school curriculum related to computer science or cybersecurity. To compute the frequency ordering of the letters in the ciphertext, count the number of times each letter appears and arrange them in descending order based on their frequency. Then, one can make an educated guess for the decryption key by mapping the frequency ordering of the ciphertext letters to the standard English letter frequency ordering: ETAOINSHRDLCUMWFGYPBVKJXQZ.
Without the actual ciphertext provided, the detailed steps of calculation and mapping cannot be executed; however, the concept generally involves aligning the most frequent letters in your ciphertext with 'E', 'T', 'A', and so on, then the least frequent with 'Z', 'Q', 'X', etc., to predict the potential decryption key.