Max. Marks: 20 18th October, 2017 Instructions This is closed book closed notes

Question

Max. Marks: 20 18th October, 2017 Instructions This is closed book closed notes exam. Only one A4 size formula sheet is allowed Ifyou think any data is missing, make suitable assumptions · · Time allowed is ONE (1) hour Switch off your mobile phone Q.No.1) Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock (04 Marks) resistance. The results from 100 disks are summarized as follows: Shock resistance Low Hi Scratch High 70 Resistance Low 16 Let A denote the event that a disk has low shock resistance, and let B denote the event that a disk has high scratch resistance. Determine the following: ) (01 Marks) a) P(A) b) P (B) (01 Marks) P(A/B) (02 Marks) harfuddin Ahmed Khan EEM Department Page 1

Explanation / Answer

a) P(A) :

Total having low shock resistance = 9 + 5 = 14

P = 14/100 = 0.14

b) P(B) = 79/100 = 0.79

c) P(A/B) = 9/79 = 0.114

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