(a) Two independent random variables X, Y have zero mean, and variance 3,6 respectively. Estimate how large a > 0 has to in order to have P(|X+Y| ≥ a) ≤ 1 -? 100

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.CR: Chapter 13 Review
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(a)
(b)
Two independent random variables X, Y have zero mean, and variance 3, 6
respectively. Estimate how large a > 0 has to in order to have
P(|X + Y≥ a) ≤
100
·?
Let X be a nonnegative random variable with moment generating function
Mx(X) = eH(X), H: [0, ∞) → [0, ∞).
Suppose it holds for all λ, t > 0 that λt – H(X) ≥ G(t). Prove:
P(X > t) ≤ e-G(t).
Transcribed Image Text:(a) (b) Two independent random variables X, Y have zero mean, and variance 3, 6 respectively. Estimate how large a > 0 has to in order to have P(|X + Y≥ a) ≤ 100 ·? Let X be a nonnegative random variable with moment generating function Mx(X) = eH(X), H: [0, ∞) → [0, ∞). Suppose it holds for all λ, t > 0 that λt – H(X) ≥ G(t). Prove: P(X > t) ≤ e-G(t).
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