Researchers want to determine how long tics stay on domestic dogs if the tics are not forcibly removed. A sample of 7 dogs with 1 tic were monitored, and the number of days until the tic fell off was recorded below. (Note: Fractional days are OK. For example, 7.5 days would represent 7 days 12 hours). Calculate the standard deviation of the data shown, to two decimal places x 14.6 4.4 13.1 10.3 11.1 21.8 23.2