20. According to the United States Postal Service, http:www.usps.gov, May 15, 1998, Dogs have caused problems for letter carriers for so long that the situation has become a cliché. In 1983, more than 7,000 letter carriers were bitten by dogs. ... However, the 2,795 letter carriers who were bitten by dogs last year represent less than one-half of 1 percent of all reported dog-bite victims. Suppose that during a year 94% of the letter carriers are not bitten by dogs. Assuming that dogs bite letter carriers randomly, what percentage of those who sustained one bite will be bitten again?