A Capo Town courier service promises that 80% of Johannesburg-bound parcel deliv

Question

A Capo Town courier service promises that 80% of Johannesburg-bound parcel deliveries will reach their destinations within 12 hours What is the probability that of the seven parcels sent at random times by a particular client in Cape Town, only one is delivered late? 0.3670 0.2753 0.2097 0.0004 0.0287 Refer to the information given in question 6: What is the probability that seven parcels sent random times by a particular client in Cape Town, only one delivered within 12 hours? 0.0004 0.2753 0.2097 0.0043 0.3670

Explanation / Answer

6)

p ( prob of reaching on time) = .80

p ( prob of not reaching on time) = 1-.80 = .20

P(X=1) = 7C1(.2^1)(1-.2)^6 = .367

Answer is option 1

7)

p(prob of reaching on time) = .80

p ( prob of not reaching on time) = 1-.80 = .20

P(X=1) = 7C1(.8^1)(.2)^6 = .000358 or .0004

Option 1 is right

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