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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.
