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Nov 2023 p52 q2
2996
George has a fair 5-sided spinner with sides labelled 1, 2, 3, 4, 5. He spins the spinner and notes the number on the side on which the spinner lands.
George spins the spinner 10 times.
Find the probability that he obtains a 5 more than 4 times but fewer than 8 times.
Solution
The problem involves a binomial distribution where the probability of obtaining a 5 on a single spin is \(p = \frac{1}{5} = 0.2\), and the probability of not obtaining a 5 is \(1 - p = 0.8\). George spins the spinner 10 times, so \(n = 10\).
We need to find the probability of obtaining a 5 more than 4 times but fewer than 8 times, i.e., \(P(5 \leq X \leq 7)\).