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This question was previously asked in

SSC CGL Tier-II ( JSO ) 2017 Official Paper ( Held On : 22 Feb 2018 )

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Option 3 : 4

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345924

10 Questions
10 Marks
7 Mins

**Given**

P(3) = P(4)

**Concept**

In poisson distribution = it is also a discrete distribution. Poisson distribution fulfil the limitation of nomal distribution

Poisson distribution is given by f(x) = (e^{-λ} × λ^{x})/x!

Where x = 0, 1, 2, 3---- and λ = mean

**Calculation**

Here x = 3 and 4

**⇒** (e^{-λ} × λ^{3})/3! = (e^{-λ} × λ^{4})/4!

⇒ λ = 4!/3!

⇒ λ = 4

∴ **mean of x in poisson distribution is 4**

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