Seven years less than 13 times the age

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