Probability and Statistics Test Review

How are you feeling today?

• Great!

• So-so

• Could be better...

• Having a tough day.

You randomly choose one marble from the bag. What is the theoretical probability of choosing a blue marble?

• $\frac{6}{15}\ or\ \frac{2}{5}$
  

• $\frac{9}{15}\ or\ \frac{3}{5}$

• $\frac{3}{15}\ or\ \frac{1}{5}$

Tags

CCSS.7.SP.C.7B

What is the theoretical probability of spinning a red or a yellow?

• $\frac{2}{5}$

• $\frac{1}{5}$

• $\frac{3}{5}$

• $\frac{0}{5}$

Tags

CCSS.7.SP.C.7B

Three coins are flipped. Using the tree diagram, how often would you expect to flip 1 tails and 2 heads (in any order)? Write your answer as a fraction, decimal, or percent.

Tags

CCSS.7.SP.C.8B

Monica randomly picks 2 marbles from a bag. She keeps each marble after she picks it. The bag contains 11 plastic marbles, 9 wooden marbles, 7 glass marbles, and 8 metal marbles.

If she picks a metal marble the first time, what is the probability she will pick a second metal marble? You can write your answer as a fraction, decimal, or percent.

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.8

What is the probability of selecting a "B" on the first spinner and a "Z" on the second spinner?

• $\frac{1}{4}$

• $\frac{2}{7}$

• $\frac{1}{12}$

• $\frac{1}{3}$

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

CCSS.7.SP.C.8

Use the Fundamental Counting Principle to find the total number of possible outcomes.

At a middle school, the 7th graders will conduct a survey for where to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year
• to randomly choose some 7th grade students to select a location
• to ask all 7th grade teachers and administrators for a location
• to ask the student council to choose a location

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

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

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

If you score 76, 85, 97, and 83 on your math tests, what would your median score be?

• 84

• 90

• 85

• 88

Tags

CCSS.6.SP.B.5C