Probability... I hope the dead sometimes cover their ears

Ava has 4 yellow t-shirts, 6 black t-shirts, and 2 blue t-shirts to choose from for her outfit today. She chooses a t-shirt randomly with each t-shirt equally likely to be chosen. Find the probability that a black or blue t-shirt is chosen for the outfit.

If a fair 15-sided dice is rolled, find the probability that the roll is an odd number or prime number or both?

Your hilarious maths teacher randomly assigns everyone a 2 hour long online test to be completed at a specific time on the weekend between 4 pm and midnight on either Saturday or Sunday.

What are the chances your test is on Saturday between 4pm and 6pm?

• 0.25

• 0.125

• 0.375

• 0.4

If the chance of a flight being delayed is 0.2 (=20%), what are the chances of no delays on a round trip?

• 0.64

• 0.04

• 0.16

• 1

A coin is tossed three times. Find the probability of getting at least two heads.

A coin is tossed three times. Find the probability that head and tail show alternately.

• none of these

A coin is tossed three times. What is the probability of getting two heads and one tail?

A code consists of a digit chosen from 0 to 9 followed by a letter of the alphabet. What is the probability the code is 9Z?

A bag contains 5 red marbles, 4 green marbles and 1 blue marble. A marble is chosen at random from the bag and not replaced; then a second marble is chosen. What is the probability both marbles are green?