# Math

a 10 question multiple choice test has 4 possible answer for each question. A student selects at least 6 correct answers.

Find probability of this event:

(multiple choice)
A) .118
B) .995
C) .068
D) .571

1. 👍 0
2. 👎 0
3. 👁 103
1. he got 6 right, 4 wrong. The question has no answer. Did he randomly guess, or did he know the answers to only six?
If he knew the answers to six, the probability is 1 that he gets those six.
If he knows 5, the prob is 1 he gets those right, plus pr =4(1/4)(3/4) he gets one more or a pr of .75 he gets six right knowing 5, guessing on the last four.

Well, we need to know how many he knew, I think.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Math

A multiple-choice test has four possible answers for each question. If a student guesses at the answer, what is the probability that he or she selects the correct answer

asked by Pamela Straw on November 1, 2012
2. ### English for john browm

Let me give you something on "multiple-choice" items that may help you to guess better. Many teachers prepare multiple-choice tests because they are easy to mark and offer the student the advantage of actually seeing what the

asked by SraJMcGin on May 7, 2009
3. ### Statistical concept 68-95-99.7

1. A student taking a midterm exam in Ancient History comes to two questions pertaining to a lecture that he missed, and so he decides to take a random guess on both questions. One question is true-false and the other is multiple

asked by Surpreet Pororsha on April 21, 2016
4. ### Stat HW for.

1. A student taking a midterm exam in Ancient History comes to two questions pertaining to a lecture that he missed, and so he decides to take a random guess on both questions. One question is true-false and the other is multiple

asked by Jen N. on April 21, 2016
5. ### Statistics Algebra 2

A 10-question 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

asked by Dloc on May 8, 2016
6. ### Statistics

A student guesses blindly on a 20-question multiple choice test. If each question has 4 answer choices (only one of which is correct), what is the probability that the student will answer exactly 10 questions correctly?

asked by Sierra on February 20, 2015
7. ### math

a multiple choice test has 8 questions with 4 possible answers for each question. if a student were to guess the answer to each question how many different ways would there be to answer the test A. 32 B. 4 C. 65 536 D. 4 096

asked by steve on May 24, 2011
8. ### statistics

A student is taking a multiple choice test where each question have 5 possible answers of which only one is right. If the student knows the answer the student answers correctly, otherwise there is a 20% probability of correct

asked by erick on September 12, 2012
9. ### statistics

10. A student is taking a multiple choice test where each question have 5 possible answers of which only one is right. If the student knows the answer the student answers correctly, otherwise there is a 20% probability of correct

asked by mutinda on September 12, 2012
10. ### Statistics

You have a ten question multiple choice test in your next class and you did not study at all. Each question has four choices and only one correct answer. You are going to guess on each question. What is the probability that you

asked by Liz on May 7, 2013

More Similar Questions