Question

Antoni throws a normal six-sided dice 120 times. How many times would you expect him to throw a 4?

Answer 1

Answer:

Perhaps an easier question: If you roll a die 6 times, how many 4s would you expect to get?

1, right? 1 out of every 6. That’s what 1/6 means.

If you roll a die 12 times, you expect 2. 2/12 = 1/6

So… how many times would you expect to get it if you rolled it 120 times?

20/120 = 1/6

Twenty out of 120 times, on average.

As others have said, the general formula is:

expected successes = probability*number of trials