The phrase
"good guesser" means that someone is good at making a correct or close estimate or prediction, even if they do not have all the facts or information.
Full definition
Unless you're a
really good guesser — like you always know the number of jelly beans in the jar at the state fair — you'll either underestimate your need, leaving your loved ones unable to cover expenses, or you'll overestimate and pay a lot more for your policy than you need to.
Then various ideas to see who is
best guesser - most right, closest,... eventually finding standard deviation of their guesses.
Given that most of the exam is multiple choice,
a good guesser who can do the simpler questions will pass.
Dogs without a leader are just guessing what they should do and Hint: Dogs are
good guessers.
Or, sometimes, were
better guessers.
They hadn't even taught her anything yet and passed because she is
a good guesser.