A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of 60 thousand miles and a standard deviation of 12 thousand miles, Complete parts (a) through [d] below, a. What proportion of trucks can be expected to travel between :14 and 60 thousand miles in a year? The proportion of trucks that can be expected to travel between 44 and 60 thousand miles in a year is 0,4038', (Round to four decimal places as needed) b. What percentage oftrucks can be expected to travel either less than 50 or more than 80 thousand miles in a year'l The percentage oftrucks that can be expected to travel either less than 50 or more than 80 thousand miles in a year is 2508 '14:, (Round to two decimal places as needed) c. How many miles will he traveled by at least 60% otthe trucks? The number of miles that Will he traveled by at least 60% ofthe trucks is miles. (Round to the nearest mile as needed.)