# ece 6001

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ece 6001
ECE 6001, Probability and Random Variables
OSU, Autumn 2012

Aug. 28, 2012
Due: Sep. 4, 2012

Problem Set 1
Problem 1
For the set Ω = {1, 2, 3, 4},
(a) Find the minimal ﬁeld that contains the subsets {1, 2} and {2, 4}.
(b) Find the minimal ﬁeld that contains the subsets {1, 2} and {3, 4}.
Problem 2
Consider the random experiment: The time until a PC fails is observed.
(a) Deﬁne a sample space Ω for this experiment.
(b) Describe a possible relevant choice for the ﬁeld F .
(c) Deﬁne two events that are mutually exclusive.
(d) Deﬁne two events that have a nonempty intersection.
Problem 3
A photon counter connected to the output of a ﬁber detects the number of photons,
{Ni , i 1}, received for successive pulses generated by a laser connected to the input of the ﬁber. Specify which one of the following sequences of events, {Ek , k 1} is increasing, decreasing or none. Very brieﬂy explain why.
(a) Ek = {N1

k} for k

1

(b) Ek = {Nk = 0} for k

1

(c) Ek = {minm

k

Nm = 0} for k

1

(d) Ek = {maxm

k

Nm

1

k} for k

Problem 4
For a sequence of events, {En , n

1}, prove the following:

(a) The union bound,

Ei

P

P (Ei )

i=1

i=1

1

(b) If En ր (increasing), then lim P (En ) = P

n→∞

lim En

n→∞

c
Also using the fact that En ց, argue that the same is true for decreasing sequences.

Hint: In both parts construct another sequence, {Fn , n for which ∞ Fi = ∞ Ei . i=1 i=1

1}, of mutually exclusive events

Problem 5
1
Let E1 and E2 be two events and P (E1 ) = 4 . Evaluate P (E2 ), if c (a) E2 = E1

(b) E1 and E2 are mutually exclusive and P (E1 ∪ E2 ) =

1
2

(c) E1 and E2 are both mutually exclusive and independent
(d) E1 and E2 are independent and P (E1 ∪ E2 ) =
(e) P (E1 |E2 ) =

1
2

and P (E2 |E1 ) =

1
2

3
4

Problem 6 (Optional) Matlab Experiment: Relative Frequency
(a) Write a Matlab program to generate N trials of a random number

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