Probability Sampling

P(not A) =

*Remember to simplify.*

• 2/6

• 3/4

• 2/8

• 1/4

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

Which statement best describes a random sample of all students in a middle school?

• Of all the students who are on the track team, the first three to finish a race are selected.

• Of all the students who are in the drama club, every third student on the roster is selected.

• Of all the students who complete an assignment, the first, third, and tenth students are selected.

• Of all the students who attend a school-wide assembly, those sitting in every third seat are selected.

Which statement best describes a random sample of all students in a middle school?

• Of all the students who are on the track team, the first three to finish a race are selected.

• Of all the students who are in the drama club, every third student on the roster is selected.

• Of all the students who complete an assignment, the first, third, and tenth students are selected.

• Of all the students who attend a school-wide assembly, those sitting in every third seat are selected.

Andre wants to survey a random sample of the student body in his school to find out which day after school would work best for students to do volunteer work for a local charity. Which sample would best represent the student body?

• asking twenty students waiting in line for lunch

• asking twenty students on their way to the bus after school

• asking one person from the seventh grade daily for twenty days

• asking one person each from twenty different classrooms during the first class period

A likely chance event is closer to what number?

• 0

• 1

• .5

• 100

A hat contains 6 black stones, 2 white stones and 2 gold stones. The probabilities of selecting a white stone or a gold stone are equal.

• True

• False

What is the probability of spinning a blue or red?

• unlikely

• neither likely nor unlikely

• likely

• certain

• impossible