Question

1.Average waiting time between 2 consecutive clients at coffee shop is 12 min. Given you already waited 3 min, what is the probability that you will wait more than 9 minutes from now until your turn comes?

A e^-1

B e^1

C e^-3/4

2. Accidents occur at an average of 4 per week. What's the probability that more than 1 accident will occur during a given week?

A.1-4e^-5

B.1-5e^-4

C. 5e^-4

3.In above setup: what's the probability that we'll have to wait at least 2 weeks between 2 consecutive accidents?

A.e^-4

B.e^-8

C.1-e^-4

4.

The roulette wheel has 38 spaces on it, numbered 0,1,2,...,36 and 00. Ivy bets each time that the outcome will be a number within {1,2,...,18}. What's the probability that she loses the first 6 bets (trials)?

A.(10/19)^6

B.(10/19)^5

C.(9/19)^6

In above setup: what's the probability that the first time when she wins is at the 6th bet?

A.(10/19)^6

B.(9/19)(10/19)^6

C.(9/19)(10/19)^5

In above setup: given she lost the first 6 bets, what's the probability that from now on she will need more than 8 bets until her fist win?

A.(9/19)^14

B.(9/19)^6

C.(10/19)^8

Answer 1

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