The central intelligence agency (cia) has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages. in standard english text, the letter i is used at a rate of 7.54%. find the mean and standard deviation for the number of times the letter i will be found on atypical page of 2400 characters. (round answer to one decimal place.) ? = 180.96 correct (round answer to two decimal places.) ? = 12.94 correct give the interval of usual values for the number of i's appearing on a page of 2400 characters. (enter answer as an interval using square-brackets only with whole numbers.) usual values = [181] incorrect