If r(x) and s(x) are inverse functions, which statement must be true? a) r(s(x))=1 b) r(s(x))=x c) r(x) r(x)= 1/s(x) d) r(x)=-s(x)

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?