He quarterly returns for a group of 61 mutual funds are well modeled by a Normal model with a mean of 7.5% and a standard deviation of 1.1%. Use the 68-95-99.7 Rule to find the cutoff values that would separate the following percentages of funds, rather than using technology to find the exact values. a) the highest 50% b) the highest 16% c) the lowest 2.5% d) the middle 68%