Question

The Central Intelligence Agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages that are sent as ciphered text. In Standard English text, the letter r is used at a rate of 6%.
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 ciphered message sent to Iran, a page of 2600 characters is found to have the letter r occurring 178 times. Is this unusually low or high?


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  • CreatedMay 03, 2015
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