You have a 5question multiplechoice test. Each question has four choices. You don’t know any of the answers. What is the experimental probability that you will guess exactly three out of five questions correctly?
 👍
 👎
 👁
 ℹ️
 🚩
2 answers

As you know, the probability of answering k out of n questions correctly, given P(correct) = p, is
nCk * p^k * (1p)^(nk)
So, since you have
n=5
k=3
p=1/5
p(3 of 5) is 5C3 * (1/5)^3 * (4/5)^2 = 32/625
That is the theoretical probability. For experimental, you'd need to run several trials, and see how many times you got 3 of 5 correct. 👍
 👎
 ℹ️
 🚩

oops. my bad. That would be 1/4 and 3/4, not 1/5 and 4/5
 👍
 👎
 ℹ️
 🚩
Answer this Question
Related Questions

English
I don't really understand this question and, I know you said to other people go look at the other exact same question but they don't really help and I don't want to get a B in ELA. I don't want the answer, I just need help on the question like giving me

8th grade Math
What is the decimal equivalent to 72/100? A.7.2 B. 0.72 C. 0.072 D. 0.0072 Rational numbers unit test part 1 connections academy (I don't need the answer but when I did I couldn't find it so I'm putting up the question for anyone who needs it please leave

Math
Find the odds against correctly guessing the answer to a multiple choice question with 6 possible answers.

Math
Select all possible values for x in the equation. x cubed=375. 5*the cubed root of 3 the cubed root of 375 75*the cubed root of 5 125*the cubed root of 3 I am trying to do a practice test to prepare for my real test tomorrow and I don't understand the

Chemistry
Does anyone have the CORRECT answers for the international connections academy Chemistry 10B Unit 2: Solutions, Acids, and Bases Lesson 12:Unit Test? Preferably all of them, but at least the multiple choice.

statistics
A multiple choice test has 3 questions and each question has 3 choices. If Nacho takes this test, what is the probability that he will: (a)answer all questions correctly? (b)answer all questions wrong? (c)answer two questions correctly?

TLC purity
Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is 0.95, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify

Calculus derivative
Find the slope and an equation of the tangent line to the graph of the function f at the specified point. f(x)=1/3x^2+5x+5: (1, 1/3) Answer: f’(x)=2/3x + 5 y=2/3x 1 I reworked the problem and got f'(x)=5, y=5x+ 14/3 This is from a multiple choice

Language arts
Please check my answers. Thank You! Use the text passage to answer the question. Whatever you post online—whether a silly picture, angry comment, or sharing about a chronic illness—is there forever. Delete it all you want, but colleges and employers

Math
Multiple Choice For questions 15, solve the equation. 1. 9p  17 = 10 A. 3 B. 16 C. 18 D. 16 I'm not too sure, I think it's 3, but I don't know. Can anyone help please!

Statistics Algebra 2
A 10question multiple choice test has 4 possible answers for each question. A student guesses on all ten answer. a)What is the probability that the student selects at least 6 correct answers? b)Is getting exactly 10 questions correct the same probability

math
Louann and Carla received equal scores on a test made up of multiple choice questions and an essay. Louann got 14 multiple choice questions correct and received 24 points for her essay. Carla got 16 multiple choice questions correct and received 14 points

Math
~~~~WARNING HARD MATH~~~~ An integer from 100 to 999, inclusive, is to be chosen at random. What is the probability that the number chosen will have 0 as at least 1 digit? Multiple Choice: Underline or circle the letter that best solves the question. a)

Chem II  Equilibrium
For the reaction at 430 degree C, H2 + I2 2HI Kc = 54.3. Initially 0.714 moles of H2 and 0.984 miles of I2 and 0.886 moles of HI are placed in a 2.40 L vessel. The equilibrium concentration of H2 and I2 are _____. Ok, I tried this by changing the moles to

Social studies
Which of the following drives the free market economy? ○A. the needs and wants if people ○B. the supply of goods in the market ○C. the number of consumers in the market ○D. The gross domestic product I don't understand this question! I probably

Test taking Stratagies (2 questions) help me plz
1.)Which of the following is a good way to approach answering an essay question on a test? A.)Start writing your answer as soon as you have read the question B.)Jot down a rough outline before you start writing**** C.)Write as much as you possibly can

Technology
Which of the following is not an example of an Objective question? Multiple choice Essay True/false Matching•• Why is it important to recognize the key word in an essay question? It will provide the answer to the essay It will show you a friends answer

Math
Betsy is making a flag. She can choose 3 colors from red white blue and yellow. How many choices does Betsy have? I get 8 or 16. Am I right? Do I count choices that are in diferint order as another choice? r w b r b w Is that 1 choice or 2?

geography
21. what is the role of the government in a mixed economy? could anyone help me in any way by the way this is not a multiple choice question

MATH
Sally is evaluating some test papers. There are 80 multiple choice questions in the test. Students get two points for every correct answer and for every wrong answer or any question left blank, one point is deducted from the total score. Mick got 115
Still need help?
You can ask a new question or browse existing questions.