Important question on probability

In a class of 10 student, probability of exactly I students passing an examination is directly proportional to i^(2). Then answer the following questions: The probability that exactly 5 students passing an examination is

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Most important question class 10 chapter 4 Quadratic equation

[" Sample Question Paper "],[" Section 'B" "],[" If two coins are tossed simultaneously.Find the probability of getting 2heads."],[" If two coins are tossed simultaneously.Find the probability of getting 2heads."]

In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.

In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.

Find the.(a) Probability of the pointer stopping on D in (Question 1-(a))?(b) Probability of getting an ace from a well shuffled deck of 52 playing cards?

In a test an examinee either guesses, copies or knows the answer to multiple choice question with five choices. The probability that he makes a guess is 1/4 and probability that he copies the answer is 1/8 . The probability that his answer is correct given that he copies is 1/10 . Find the probability that he knows the answer to the question given that he correctly answered it: