Fourth block 05/10

What is the probability of spinning green?

• 0
• 1/4
• 1/2
• 3/4

Clara picks a marble at random, puts it back, and then picks another marble at random.

• Dependent
• Independent

A bag contains 9 green marbles, 5 yellow marbles and 6 red marbles.  You choose one marble.   What is the probability of selecting a green or red marble?  Do you add or multiply probabilities?

• Add
• Multiply

Two events are mutually exclusive if:

• they cannot happen at the same time
• they can happen at the same time
• they always happen 
• they never happen 

If E be an event  such that P(E) = 3⁄7, then P(not E) is _______

• 4⁄7
• 6⁄7
• 5⁄7
• None of these

A box contains 5 red, 4 green and 3 black balls.  A ball is drawn at random from the box.  The probability of drawing a green ball is____

• 4⁄12
• 4⁄11
• 4⁄10
• 4⁄9

A bag contains 5 red, 3 green and 5 black balls. A ball is drawn at random from the bag.  Find the probability that the ball is not red

• 5⁄13
• 3⁄13
• 8⁄13
• 5⁄12

A bottle contains 8 marbles, 3 are red and 5 are blue. You are to take a marble from the bottle without looking. What is the probability that you pick a red marble?

• 1/3

• 3/8

• 5/8

• 3/5

A die is rolled, what is the probability that the number rolled is greater than 2?

• 2/3

• 1/3

• 1/2

• 1/4

In a school club there are 3 freshmen, 5 sophomores, 4 juniors and 7 seniors. One student is chosen at random. What is the probability that the student chosen is a senior?

• 7/19

• 3/19

• 4/19

• 5/19