A family has a baby girl.
Will this affect the chances of their next baby being a girl?
A coin is tossed and lands on tails.
Will this affect the chances of the coin landing on tails in the next toss?
Valerie owns $9$9 red shirts and $9$9 blue shirts.
She randomly chooses a shirt for the day, and she gets a red shirt.
At the end of the day, she puts it into the washing basket.
In a bag, there are $3$3 yellow marbles and $4$4 green marbles.
A marble is randomly selected from the bag and it turns out to be yellow.
The marble is not put back into the bag.
Investigate simple situations that involve elements of chance by comparing experimental results with expectations from models of all the outcomes, acknowledging that samples vary.