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Preparing for CBSE

Chapter 7 - The Mathematics of Maybe: Introduction to Probability | 5 questions | about 4 minutes

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Question 1 of 5
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Question 1 of 5
One letter is selected at random from the word PROBABILITY. What is the probability of selecting the letter B?
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Question 2 of 5
Which of the following is a random experiment?
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Question 3 of 5
A tyre company records the following distances before replacement in \(1{,}000\) cases: \(20\) lasted less than \(4{,}000\) km, \(210\) lasted \(4{,}001\)–\(9{,}000\) km, \(325\) lasted \(9{,}001\)–\(14{,}000\) km, and \(445\) lasted more than \(14{,}000\) km. What is the experimental probability that a tyre lasts between \(4{,}000\) km and \(14{,}000\) km?
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Question 4 of 5
A box contains \(3\) red, \(4\) black and \(2\) green pens. A pen is selected, replaced, and then a second pen is selected. What is the probability that both pens have the same colour?
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Question 5 of 5
A school wants to estimate the favourite sport of all \(1{,}200\) students. It surveys only the \(40\) students who attend the basketball coaching programme. Which change would most improve the estimate?
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