A government agency has specialists who analyze the frequencies of

  

A government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages. In standard English text, a particular letter is used at a rate of 7.8%. A. Find the mean and standard deviation for the number of times this letter will be found on a typical page of 2900 characters. u=____ o=____ (round to one decimal place as needed) B. In an intercepted message, a page of 2900 characters is found to have the letter occurring 266 times. Is this usual? A) No, because 266 is within the range of usual values B) Yes, because 266 is below the minimum usual value. C) Yes, because 266 is within the range of usual values. D) Yes, because 266 is greater than the maximum usual value. 

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