Help needed in finding trend using bollinger bands!

Hey guys, I have a question regarding bollinger bands. i know what bollinger bands are and what is the significance of the upper and lower bands. i also know that price sometimes go outside the bands(5% according to the book).

i need to learn how to predict when the price is going outside the band or when it is going to reverse.

Here is a sample image:

bollinger band.jpg

can anyone please tell me how to find out where the price is going to move? whether its going to move outside the band or its going to reverse. thanks in advance.

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