Morse code uses "dots" and "dashes," which are known to occur in the proportion of 3: 4. this means that for any given symbol, p(dot sent) = 3/7 and p(dash sent) = 4/7. unfortunately, when coded messages are sent, there are sometimes errors in transmission. suppose there is interference on the transmission line, and with probability 1/8 a dot is mistakenly received as a dash, and vice versa. a) what is the probability that the received symbol is a dot?