Question: 15. Deciphering Messages The Central Intelligence Agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages.

15. Deciphering Messages The Central Intelligence Agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages.

In standard English text, the letter r is used at a rate of 7.7%.

a. Find the mean and standard deviation for the number of times the letter r will be found on a typical page of 2600 characters.

b. In an intercepted message sent to Iraq, a page of 2600 characters is found to have the letter r occurring 175 times. Is this unusual?

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