Just a really dumb question here. If I surveyed a group of 30 people and a get a mean age of 20 and a standard deviation of 15. What does that tell me?

I am guessing that it implies most of my participants range from age 5 to 35? And given that there are only 30 people, and the wide range, it is a bit pointless to look at the mean and standard deviation after all.

Am I correct in saying that?

Mandy