Deciphering Messages The Central Intelligence Agency has specialists who analyze the frequencies of letters of the alphabet
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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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Jehal Shah
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