The daily exchange rates for the five-year period 2003 to 2008 between currency A and currency B are well modeled by a normal distribution with mean 1.143 in currency A (to currency B) and standard deviation 0.031 in currency A. Given this model, and using the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely, complete parts (a) through (d). a) What is the probability that on a randomly selected day during this period, a unit of currency B was worth more than 1.143 units of currency A? The probability is 50%.. (Type an integer or a decimal.) b) What is the probability that on a randomly selected day during this period, a unit of currency B was worth less than 1.081 units of currency A? The probability is 2.5 %. (Type an integer or a decimal.) c) What is the probability that on a randomly selected day during this period, a unit of currency B was worth less than 1.050 units of currency A? The probability is %. (Type an integer or a decimal.)