Question

***(100 POINTS)***

Colin predicted whether he got answers right or wrong in his 50 question exam.
He identified the 18 questions he thought he got wrong.
It turns out that Colin got 3 questions right that he thought he got wrong.
Colin also got a total score of 27 out of 50 in the test.
What is the percentage accuracy he had with predicting his scores?

Answer 1

• 65.22%

Explanation:

Given

• Total questions - 50
• Predicted wrong - 18 answers

Actual score - 27, so actual number of wrong answers is

• 50 - 27 = 23

Actual number of Colin's predicted wrong answers is

• 18 - 3 = 15

The percent accuracy Colin had with prediction is:

• 15/23*100% = 65.22%