Probability

The probability of it raining today is 30%.  What is the probability that it will NOT rain?

• 30%

• 70%

• 100%

• 0%

P(not A) = 
*Remember to simplify.*

• 6/8

• 3/4

• 2/8

• 1/4

Which event is not a dependent event?

• Picking 2 students to each be line leader and door holder from a group of 20 students

• Picking 2 marbles from a bag without replacing the first marble

• Picking 2 crayons from a box at the same time (simultaneously) 

• Picking an earring, replacing it, then picking a 2nd earring

If the odds of being born on each day of the week is equal, what is the probability of two separate babies both being born on a school day? (Monday through Friday)

• 5/7

• 5/14

• 25/49

• 1/49

A farm has 5 brown cows and 10 white cows. A fence is open and two cows escape. What is the probability that it will be a brown cow, then a white cow?

• 1/9

• 2/9

• 5/21

• 10/21

A store sells shirts that are either small, medium, or large. The colors are either red, blue, green, or white. What is the probability someone will select a large green shirt?

• 1/3

• 1/7

• 1/9

• 1/12

You roll two die.
What is the probability you will roll a 4, then roll a number less than 3?

• 1/36

• 1/18

• 1/9

• 1/6

If I roll a die 30 times, it should land on '4' five times. Is this an example of theoretical or experimental probability?

• Theoretical

• Experimental

I spun a spinner 20 times and landed on red 7 times. Is this an example of theoretical or experimental probability?

• Theoretical

• Experimental

I flipped a coin 50 times. It landed on heads 29 times and tails 21 times. Which statements are true for heads?

• Theoretical = 1/2; Experimental = 1/2

• Theoretical = 29/50; Experimental = 1/2

• Theoretical = 1/2; Experimental = 29/50

• Theoretical = 1/2; Experimental = 21/50