New MacBook Pro - Question

Hi pals

I bought a macbook pro mid 2012, so i ve charged my battery for first time.

The screen shows 100% charged, but when i disconnect the connector, it goes down until 94% or 95% immediately.

I've bought it yesterday, it has two cicles of fully charge.

It is normal? its my first mac, and i dont find the answers on internet (or i dont know how to).

Thanks a lot!