Statistics and Probability

You draw a marble from a bag that has 4 red, 2 blue, and 3 green, you also flip a fair coin. What is the probability you will draw a blue marble and flip a heads?

• 1/9

• 3/9

• Susan 2

• 5/6

Cesar's piggy bank has 8 quarters, 2 dimes, 4 nickels, and 6 pennies. He chooses a coin, does not replace it, then chooses another. What is the probability that he chose a dime then a nickel? 

• 1/50

• 2/95

• 1/10

• 4/19

Find the outlier of the set of data: 7, 8, 11, 7, 6, 15, 31, 11 

• 7

• 15

• 11

• 31

According to a random telephone survey, 85% of all working adults in the U.S. are satisfied with their current job. If I asked 500 adults, how many do you predict would be satisfied with their current job?

• 85 adults

• 340 adults

• 500 adults

• 425 adults

Manny wants to know how many students at CTMS enjoy solving math problems. What is the best sampling method?

• ask for 20 volunteers to discuss whether they enjoy solving math problems

• ask the last 20 people to arrive at CTMS 

• Randomly ask 2 students in the hallway

• Ask every 20th student that walks into school

A recent survey of 800 seventh graders from across the state shows 4 out of 10 like to play paper football. How many students said they like to play paper football?

• 40 students

• 200 students 

• 320 students

• 8,000 students

If a set of data has a symmetric distribution, the most appropriate measure of center and variation to use is...

• median & interquartile range

• mean & interquartile range

• median & mean absolute deviation

• mean & mean absolute deviation

In a game, the probability of winning is 1 out of 5. How many times could Lisa expect to win if she plays the game 85 times?

• 17

• 34

• 68

• 80

A coin was tossed 80 times, out of which it landed on heads 60 times. What is the relative frequency of the coin toss resulting in tails?

• 20%

• 25%

• 50%

• 75%

Kris has a bag that contains only red marbles, green marbles, and purple marbles. Kris pulls a marble from the bag, records the color of the marble and puts it back in the bag. She performs 25 pulls and draws 8 red marbles, 12 green marbles, and 5 purple marbles. Based on the data, about how many times would Kris pull a red marble if she performed 1,000 pulls?

• 200

• 320

• 330

• 470