The number of correct answers that a student should expect to guess on a test is 19. Using the probability formula it is determined.
What is probability?
- Probability is the measure of the likelihood of an event to occur.
- Probability is given by the ratio of the number of favorable outcomes to the total number of outcomes of an event.
- P(A)=n(A)/n(S)
- Where A is an event, n(A) is the number of favorable outcomes, and n(S) is the total number of outcomes.
Calculation:
Given that,
The probability of guessing the correct answer to a four-choice multiple-choice question is P(correct-choice)=0.25
There are a total of 76 four-choice multiple-choice questions in a test.
So, n(choice)=76
From the probability definition,
P(correct-choice)=n(correct-choice)/n(choice)
⇒ n(correct-choice)=P(correct-choice)×n(choice)
=0.25 × 76
=19
Therefore, 19 correct answers should a student expect to guess on a test with 76 four-choice multiple-choice questions.
Learn more about probability here:
https://brainly.com/question/7965468
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