Probability & Sampling

If the probability of a chance event is 0.2, it is more likely to happen than which of the following probabilities of another chance event?

• 0.1

• 0.4

• 0.3

• 0.75

The probability of a chance event is 0.5, it is __________ to happen when compared to a chance event with a probability of 1.

• More Likely

• Less Likely

• Equally Likely

• Both More and Less Likely

If the probability of a chance event is 0.82, it is more likely to happen than which of the following probabilities of another chance event?

• 0.74

• 0.98

• 0.85

• 1

Alex has a bag containing a mixture of 30 green and white marbles. Without looking, he guesses that half of the marbles in the bag are green. He randomly selected 1 marble from the bag, recorded the color, and returned the marble to the bag. After 15 trials, Alex has drawn 10 green marbles and 5 white marbles. Which of the conclusions below is best supported by his data?

• There are the same amount of green and white marbles in the bag.

• There are 10 green marbles and 5 white marbles in the bag.

• There are more white marbles than green marbles in the bag.

• There are more green marbles than white marbles in the bag.

There are 10 vanilla cupcakes, 13 chocolate cupcakes, and 4 red velvet cupcakes. If chosen randomly, what is the probability that you will pick a chocolate cupcake?

• 13

• 14/10

• 13/27

• 0

Ben wants to try a new restaurant for dinner. His online search resulted in 7 new 3-star restaurants, 5 new 4-star restaurants, and 3 new 5-star restaurants. If he were to choose a restaurant at random, what is the probability that he chooses a 5-star restaurant?

• 10%

• 20%

• 33%

• 3%

What is the probability the spinner will land on yellow during the next spin?

• 1/6

• 1/3

• 2/9

• 1/9

What conclusion can Mr. Evans make? Hint: Find the mean

• On average, students in 6th Grade have lower grades than students in 7th Grade.

• On average, students in 6th Grade have higher grades than students in 7th Grade.

• Students will always have a lower math grade in 6th Grade than 7th Grade.

• On average, students in 6th Grade and 7th Grade have about the same grades.

Find the median: 88, 84, 86, 88, 92, 94, 96, 78, 88, 80, 84, 86

Hint: Start by putting the numbers in order from least to greatest

• 81

• 82

• 83

• 78

Find the median: 80, 84, 78, 90, 96, 88, 98, 74, 80, 80, 78, 82

Hint: start by putting the numbers in order

• 90

• 87

• 88

• 80