Most plants of a certain type have three leaves. However, it is known that, on average, 1 in 10000 of these plants have four leaves, and plants with four leaves are called 'lucky'. The number of lucky plants in a random sample of 25000 plants is denoted by $$\(X\)$$. Given that $$\(\mathrm{P}(X=k)=2 \mathrm{P}(X=k+1)\)$$, find $$\(k\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................
Exam No:9709_s21_qp_63 Year:2021 Question No:5(c)
Answer:
\(\mathrm{e}^{-2.5} \times \frac{2.5^{k}}{(k) !}=2 \mathrm{e}^{-2.5} \times \frac{2.5^{k+1}}{(k+1) !}\)
\(k=4\)
\(k=4\)
Knowledge points:
6.1.1 use formulae to calculate probabilities for the distribution $\text { Po }(\lambda)$
Solution:
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