# Question: Computers in a shipment of 100 units contain

Computers in a shipment of 100 units contain a portable hard drive, CD RW drive, or both according to the following table:

Portable hard drive

Yes No

CD RW

Yes 15 80

No 4 1

Let A denote the events that a computer has a portable hard drive and let B denote the event that a computer has a CD RW drive. If one computer is selected randomly,

compute (a) P (A)

(b) P (A ∩ B)

(c) P (A U B)

(d) P (A’ ∩ B)

(e) P (A|B)

Portable hard drive

Yes No

CD RW

Yes 15 80

No 4 1

Let A denote the events that a computer has a portable hard drive and let B denote the event that a computer has a CD RW drive. If one computer is selected randomly,

compute (a) P (A)

(b) P (A ∩ B)

(c) P (A U B)

(d) P (A’ ∩ B)

(e) P (A|B)

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