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In a school, there are 30 teachers in the examination committee. Out of these, 20 never commit any…
In a school, there are 30 teachers in the examination committee. Out of these, 20 never commit any error in their work. Two teachers are selected at random from the committee. The random variable $X$ is the number of selected teachers who never make an error in their work.
(i)[1.0]
What are the possible values that $X$ can take?
(ii)[2.0]
Find the probability distribution of this random variable.
(iii)[1.0]
Find the mean of this distribution.
Answer
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From ISC 2025 Improvement Mathematics Paper 1, question 10.