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A test consists of 10 truefalse questions To pass the test a student must answer at least 7 questions correctly on a true-false exam what is the probability that he or she get them all right?
The probability of getting all 10 questions right is, P(10) =(1/2)10 =0.0009765...9 questions right, P(9) =10C9 ∙(1/2)10 =10∙(1/2)10 ~ 0.009765...8 questions right, P(8) =10C8 ∙(1/2)10 ~ 45∙(1/2)10 ~ 0.043945...7 questions right, P(7) =10C7 ∙(1/2)10 ~ 120∙(1/2)10 ~ 0.1171875...The probability of passing the test with any of the grade is the sum of all theabove; P(passing)~ 0.1719 ~ 17.2%
A multiple choice question has has 5 choices What is the probability of guessing it correctly?
There is 1 right answer out of 5 possible answers, so the probability of guessing it correctly is 1/5 or 20% or 0.2.
Why is it important for scientists to calculate percent error?
To determine how right or wrong their answer is.
What is 82 percent of 1500?
To solve percent all one must do is to move the decimal of the percent over two places to the right, so 82 becomes .82, then simply multiply it by the other number and one gets their answer.Thus:1,500 * .82 = 1,230
What is the probability of drawing the jack of hearts then the queen of hearts?
It depends on what exactly the conditions are. If you mean from a 52 card deck, drawing one card right after the other, then the chance that they will be those two cards in that exact order is 1/52 * 1/51. This is pretty much a percent of a percent. .00038, or about 4 percent of a percent.
There are 50 question and you get 90 percent right how many questions were answered correctly?
45 were correctly answered
If a test had 150 questions and you got 92 percent how many did you get right?
138 answered correctly.
What percent of questions were answered correctly if you got three wrong in fourteen questions?
Divide how many questions you got right (11) by how many questions total there was (14). Then multiply it by 100. 11/14=0.78....... 0.78 x 100=78 YOUR ANSWER IS 78%
Janet took a standardized test that contained 328 questions she answered 75 percent of?
If she answered 75% of them right she would have answered 246 of them right and 82 of them wrong.
How many questions were right if you got 92 percent and there were 28 questions?
Designate the number of correctly answered questions as r. From the problem statement, r = 92 % of 28 = 0.92(28) = 25.76. If partial credit is allowed, this probably means that there were 25 questions completely right and one more that was considered three-fourths right.
What is 5 out of 12 wrong?
If you answer 5 out of 12 questions right you have answered approximately 42% of the questions correctly. This can easily be figured out by dividing 5 by 12.
If there are 85 questions in a test and you must get a 80 percent how many do you need to get right?
You would need to answer 68 questions correctly.
Out of 50 questions you only answered 40 correct what is the percent?
10% is right 40 of 50 would be 80%
What percentage would you get if you missed 2 out of 45 questions?
Assuming that you answered 45 questions and got the other 43 right, that would be 96 percent.
How many questions can you miss to get an 70 percent on a test of 125 questions?
To achieve a score of 70% on a test of 125 questions, you would need to answer 87.5 questions correctly (125 questions x 70% = 87.5 questions). Since you can't answer half of a question, you would need to round up to 88 questions. Therefore, you can miss 37 questions (125 total questions - 88 questions answered correctly = 37 questions missed) and still achieve a score of 70%.
What if you can not ask the right questions?
Then your question will not be answered.
How many question can you miss to get a 70 percent on a 186 question test?
70 percent of 186 = 130.2. As you cannot get 0.2 of a question right, we'll round that up to 131. That leaves 55 questions you could get wrong and still score 70 percent - 70.43 to be precise. If the examiner is feeling generous, then they would round up 130 questions correctly answered from it's actual value of 69.89% to 70&, but it might be best not to bank on that.
