A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of

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 10 thousand miles. 

What proportion of trucks can be expected to travel between 58 and 70 thousand miles in a year?

What percentage of trucks can be expected to travel either less than 45 or more than 90 thousand miles in a year