As previously said, you will burn out the tablet or any other device far quicker than you will even earn enough to withdraw from most pool sites. So in the end, you would have a broken tablet and wouldn't even be able to withdraw anything.
If you have the money for a tablet, you have the money to buy an S3 or S5 from Bitmain. Go that route and you will be a lot more pleased with the end result.
Thanks for your replies. I had the feeling that my devices would burn up in the intent of mining. If you hadn't warned me, my devices would be fried up today. I'm going to save money to buy an Antminer S3. I think I will get ROI now that I get electricity for free.