Statistics and Probability Review

Roberto wants to know the favorite sport of adults in his hometown.  He surveys 50 adults at a baseball game.  Is this random or biased sampling?

• Random
• Biased

A bag contains 4 red marbles, 7 blue marbles and 5 green marbles. what is the Theoretical probability of NOT choosing a red marble if the answer was to be simplified.

• 4/16
• 3/16
• 3/4
• 12/16

What is the Theoretical Probablility of landing on red?

• 43%
• 33.3%
• 40%
• 36%

A bag has 3 red marbles, 2 blue and 4 yellow. What is the theoretical probability of pulling a red?

• 3/10
• 3/9
• 1/9
• 1/3

In a cup are the numbers 1 - 20. Find the theoretical probability of 
picking an even number. 

• 10/20
• 1/2
• 1/20
• 20/20