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That would be 1/8 or 12,5% 

3/4 equals 0,75, so if you type 0,75³ in the calculator, you should be given the anser 0.75^3 = 0.421875 or 27/64

It's the notation scientists use when dealing with a very large or very small number. 

• For example: the number 67000000000000 would be in scientific notification: 6,7·10¹³
• the number 0,000024 would be in scientific notification: 2,4·10^-5

I hope that's all you needed to know!