>>319759
Let us look at the facts. Chi chi, an accomplished martial artist, was able to compete in the World Tournament, only being beaten eventually by Goku. Later, she also seems able to use Kaio-ken, likely learning the technique from her husband. In short, she is one of the strongest Earthlings outside of the Z fighters. Certainly strong for a female.
As for Bulma, being a brilliant scientist her strength lies more in her intelligence, although she is still fairly resilient. The adventures she survives may well have killed others. Bear in mind that as a 16 year she was traveling alone, searching for Dragon Balls, fending for herself. She took a slap from Beerus too, which is pretty impressive.
Videl is a fine specimen too, although I headcanon her as a half-Saiyan on her mother's side. This explains how she surpasses her father so easily and learns to fly in a day.