Question

Suppose you have a bag of marbles. You know that there are 10 marbles in the bag,

but you do not know what colors they are. You select a marble 40 times, each time
recording its color before putting it back. In 8 out of 40 trials you select a purple
marble.
Based on the data, how many purple marbles do you estimate are in the bag? Explain
your prediction

Answer 1

8 out of 40 trials- 8/40

simplify that and it becomes 1/5

1/5 of 10 is 2

so, I'd estimate there are 2 purple marbles.