Mrs. Johns is raising tadpoles for her biology class. She is raising 100 tadpoles.

Each day she randomly scoops ten tadpoles out of the tank to make sure that they

are healthy. She notices that some of the tadpoles have spots on their tails.

Day 1: tadpoles have spots

Day 2: 3 tadpoles have spots

Day 3: 1 tadpoles have spots

Given this data, estimate how many tadpoles in the tank have spots on their tails.