The Student Room Group

Normal distribution

Why is it that for a normal distribution of P(Z > -a) is the same as P(Z < a)
Original post by Daada
Why is it that for a normal distribution of P(Z > -a) is the same as P(Z < a)


Because the r.v. Z ~ N(0,1) is symmetric about its mean , i.e. 0
(edited 11 months ago)

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