A stock has a return that follows the normal distribution with a mean of 17% and a standard deviation of 8%. What is the probability that the stock will have a return between 17-8% and 17+2*8%? The one-, two-, and three-sigma probability of the normal distribution is 68%, 95%, and 99%. Enter a number with one decimal points. Answer the question in percentage terms, i.e., if the answer is 20%, enter 20.0. Please provide the steps too.