Out of the twenty possible answers inside a Magic 8-Ball, ten of them are positive, five are negative, and five are noncommittal, suggesting you ask again later.
That means you have a 1 in 2 chance of getting a positive answer, and only a 1 in 4 chance of getting a negative one, with another 1 in 4 shot at a neutral answer.
The possible affirmative answers are SIGNS POINT TO YES, OUTLOOK GOOD, YOU MAY RELY ON IT, MOST LIKELY, YES, YES DEFINITELY, IT IS CERTAIN, WITHOUT A DOUBT, and AS I SEE IT, YES. The negatives are MY REPLY IS NO, DON’T COUNT ON IT, OUTLOOK NOT SO GOOD, VERY DOUBTFUL, and MY SOURCES SAY NO. The non-committals are CANNOT PREDICT NOW, ASK AGAIN LATER, BETTER NOT TELL YOU NOW, CONCENTRATE AND ASK AGAIN, and REPLY HAZY, TRY AGAIN.