Knowing your EQ ranges is essential to mastering your mixing and furthering your production know-how.  So below is a useful EQ frequency chart and should help offer a rough guide to frequency ranges and EQ - making it easier to decide what frequencies to focus on in your mix when you are using EQ.

The chart will help you find what frequencies to boost and cut on different instruments and sounds, over time it will help you to train your ears.

EQ Frequency Chart - A Guide To Frequency Ranges and EQ

This is a guide of course, and you should always stick to your gut insticnct and be creative with your EQ!