Sammy prepared a copper (II) sulfate solution exactly as you did, except, when he diluted to the mark in the flask, he let the meniscus go above the mark. Did Sammy's mistake make his concentration higher, lower, or the same as your concentration?
(assume you did not miss the mark)
Surely you don't need me to answer this for you!!
So you added more solvent than you should have added. Do you think it is more dilute (weaker or less molarity) or stronger (more concentrated)?