Mathematics, 01.02.2021 23:00 taetae83

A quiz consists of 10 multiple-choice questions, each with four possible answers, only one of which is correct. A student who does not attend lectures on a regular basis has no clue what the answers are, and therefore uses an independent random guess to answer each of the 10 questions. What is the probability that the student gets at least one question right? Let's decide on some notations.
Let L be the event that the student gets at least one of the questions right.
We'll use R for getting a question right and W for getting it wrong (W is essentially "not R").
Given the "tactic" of the student, what is P(R) and P(W)?
The answer given by the text is :
Explanation:
There are four possible answers and the student chooses one at random, and therefore:
P(R) = 1/4 = .25, and P(W) = 3/4 = .75
I do not understand how one can arrive at this answer. Where did the .25 and .75 come from?

Answers: 1

Show answers

Another question on Mathematics

Mathematics, 21.06.2019 15:00

Martha needs 22.25 strawberries for every 5 smoothies she makes. complete the table to see how many strawberries she would need to make 10 smoothies and 20 smoothies.

Answers: 1

Answer

Mathematics, 21.06.2019 17:30

One positive number is 9 more than twice another. if their product is 95, find the numbers

Answers: 1

Answer

Mathematics, 21.06.2019 19:00

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.

Answers: 1

Answer

Mathematics, 21.06.2019 21:00

George is putting trim around his rectangular deck, including the gate. he will need 44 feet of trim to do the entire deck. if the deck is 13 feet long, how wide is the deck?

Answers: 2

Answer

You know the right answer?

A quiz consists of 10 multiple-choice questions, each with four possible answers, only one of which...

Questions