Could use some help with this one

3. (6pts each) Local tax information shows the mean income of people living in Anytown is $90,000 with a standard deviation of $22,000 and that generally the income levels follow a bell-shaped distribution. a) What percentage of Anytown residents have an income between $46k and $90k? PC 46. 000 b) What percentage of Anytown residents have an income level over $68k? c) At what percentile does $68k occur? 15 th percentne d) What incomes marks the top 2.5% of all income levels for residents of Anytown