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Three questions about probability

(1) An instructor obsessed with the metric system insists that all multiple-choice questions have 10 different possible answers and only one is correct. What is the probability of answering correctly if a random answer is picked?

An event is unusual if probability is 0.05 or less, so is it unusual to answer the question by correctly guessing?

(2) There are 38 slots on a roulette wheel. One slot is 0 and another slot is 00, with the other slots numbered 1-36. If you bet all your money on the number 13 for one spin, what is the probability that you will win?

Is it unusual to win when you bet on a single number when unusual has a probability of 0.05 or less?

(3) 400 randomly selected flights showed 344 arrived on time. What is the estimated probability on one of the 400 flights arriving late?

It is unusual for one of these flights to arrive late if the probability is 0.05 or less?

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An instructor obsessed with the metric system insists that all multiple-choice questions have 10 different possible answers and only one is correct. What is the probability of answering correctly if a random answer is picked.
Event is unusual if probability is 0.05 or less, so is it unusual to answer the question by correctly guessing?

If you ...

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