A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of 50 thousand miles and a standard deviation of 11 thousand miles. Complete parts (a) through (d) below a. What proportion of trucks can be expected to travel between 37 and 50 thousand miles in a year? The proportion of trucks that can be expected to travel between 37 and 50 thousand miles in a year is (Round to four decimal places as needed )