You must have meant THEORETICAL probability, not EXPERIMENTAL probability.
An EXPERIMENTAL probability is one that you obtain youself by actually drawing
a card 70 times, each time putting it back and shuffling the deck, You keep a
count of how many times you succeeded in drawing a 2, 3, 4, or 5, and then
you divide by 70.

The THEORETICAL probability is calculated this way.

Here are the 52 cards:


 
A♥   2♥   3♥   4♥   5♥   6♥   7♥   8♥  9♥  10♥  J♥  Q♥  K♥ 
A♦   2♦   3♦   4♦   5♦   6♦   7♦   8♦  9♦  10♦  J♦  Q♦  K♦
A♠   2♠   3♠   4♠   5♠   6♠   7♠   8♠  9♠  10♠  J♠  Q♠  K♠  
A♣   2♣   3♣   4♣   5♣   6♣   7♣   8♣  9♣  10♣  J♣  Q♣  K♣

Here are the only "successful" cards.  There are only 16 of them:

     2♥   3♥   4♥   5♥   
     2♦   3♦   4♦   5♦
     2♠   3♠   4♠   5♠   
     2♣   3♣   4♣   5♣

That's a probability of 16 out of 52, which is the fraction 
which reduces of , which is approximately 31% of the time.

That's the theoretical, not experimental, probability.

Answer: 

If you actually did the experiment and found the experimental probability,
it should be close to 31%.

Edwin