Math Statistics

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

What is the difference in the IQRs?

• 1

• 2

• 3

• 4

Find the Mean. 

• 5.8

• 5

• 5.6

• 6

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

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

What is the interquartile range of the data?

• 8

• 9

• 13

• 21

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