Probability and Sampling

A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6
• 1/2
• 1/3
• 1/6

P(not A) =

*Remember to simplify.*

• 2/6

• 3/4

• 2/8

• 1/4

An unlikely chance event is closer to what number?

• 0
• 1
• 2
• 3

In a random survey of 50 students at Great Middle School, 32 said chocolate was their favorite flavor of yogurt. The school has 450 students. How many of them are likely to select chocolate as their favorite flavor? 

• 144
• 162
• 225
• 288

There are 25 counters in a bag: 6 red,
4 white, 7 blue, and 8 yellow. You choose one counter at random. Which color are you least likely to choose? 

• white 
• blue 
• red 
• yellow

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

• 3/10

• 3/6

• 1/9

• 1/3

An equally likely chance for an event to occur is what number?

• 0

• 1

• .5

• 100

A principal randomly chose 40 students from grade 5. Of these students, 9 were wearing watches. Based on this information, what is the most reasonable prediction of the number of students wearing watches in a group of 120 students from grade 5?

• 27
• 9
• 18
• 80

A likely chance event is closer to what number?

• 0
• 1
• .5
• 100

Twenty-five people were asked which of the four gifts was their favorite.  Which gift was favored 16% of the time?

• Flowers
• Perfume
• Jewelry
• Clothing