Answer:
she expects 250 green marbles.
Step-by-step explanation:
- note: there are total 40 marbles among which 25 are green
- as she puts it back, the total number will not change.
- probability = selected numbers/ total numbers
- repeats the experiment 400 times.
probability of getting green marbles after 400 trials:
→ (
) * 400
→ 25 * 10
→ 250