Probability
What is the probability that a coin is flipped and lands on tails? (Give answer as a fraction, percent, or decimal.)
1/2, 50%, 0.5
You are trying to decide what to wear to school. You know you have a green pair of pants, a red pair, and a blue pair. You also have a brown shirt, a plaid shirt, and a yellow shirt. How many different outfit combinations can you make?
9
(3 options for pants x 3 options for shirts = 9 total options)
Find the median of the set of numbers.
3, 6, 8, 9, 11, 14, 16, 20
10
(There are two middle numbers 9 and 11, so mean of those numbers is 10.)
What is the probability that a number cube is tossed and lands on any number 1-6?
100% or 1
What is the number of possible outcomes for spinning one spinner with 8 equal sections and another spinner with 6 equal sections?
48 possible outcomes
(8 x 6 = 48)
Find the mean of the set of numbers.
5, 8, 3, 5, 4, 2, 1
4
(Add all numbers to get 28, then divide by 7 to get 4.)
You pick one card at random from a standard deck of 52 playing cards. What is the probability of randomly picking a red card?
1/2 or 50% or 0.5
Dylane and Lysie are candidates for class president of the 7th grade. Emily, Mikah, and Emma are candidates for vice president. How many winning combinations are possible?
6
(2 x 3 = 6 total combinations)
Mario has drawn and replaced a marble out of a jar 34 times. 12 of the times he has drawn a green marble. If there are 102 marbles in the jar, how many can we predict are green?
36 green marbles
Each card in a set of cards has one of the letters from the word mathematics. The cards are shuffled. What is the probability of drawing the letter m?
2/11
Ms. Barker is packing for a trip. She packs a white blouse, a pink blouse, a blue blouse, and a green blouse. She also packs a black suit, a navy blue suit, and a gray suit. How many combinations are in the sample space?
12
(4 options for blouse x 3 options for suits = 12 total options)
Bounce Club surveyed a random sample of 55 of their members about their favorite type of music. Of the members surveyed, 22 said that jazz is their favorite type of music. There are 422 Bounce Club members.
Based on the data, what is the most reasonable estimate for the number of Bounce Club members whose favorite type of music is jazz music?
a. 22 b. 141 c. 169 d. 253
c. 169 (actual answer is 168.8, but we can round to 169)
In a game four cards are labeled N, S, E, and W. Two tiles are numbered 1 and 2. A player randomly selects one card and one tile.
What is the probability the player selects a card with S and a tile with 1?
1/8
(1 way out of 8 possible options)
How many possible outcomes are there when rolling a 6 sided dice three times?
216
(6 x 6 x 6 = 216)
In a random sample survey of 80 students at Torrey’s middle school, 24 students said that math was their favorite subject. There are a total of 300 students at this middle school. Based on the survey, which value is the best estimate for the number of students who would say that math is their favorite subject?
a. 72 b. 90 c. 150 d. 244
b. 90
(24/80 = 0.3 and 0.3 x 300 = 90)