Probability
A bag contains 4 red, 3 blue, and 3 green marbles.
3/10
3 red sock
2 blue socks
1 white sock
what is the probability that you will pick a blue sock?
2/6 or 1/3
A data set has a range of 20 and a minimum of 5.
What is the maximum value?
25
A school wants to know the average homework time.
Which method is better and why?
Survey students randomly throughout the school
Simplify:
4(2x−3)+5x
13x-12
A spinner has 10 equal sections:
4 red, 3 blue, 2 green, 1 yellow
What is the probability of landing on blue or green?
5/10 (50%)
or
1/2
A student asks only members of the basketball team what their favorite sport is.
👉 Biased or unbiased?
biased
What is the mean, median, mode, and range of the follow data set in order from LEAST TO GREATEST:
1,2,3,4,5,6,7,8,9,10,10
2. median:6
3. range: 9
4. mode: 10
What are the five values you need to make a box and whisker plot?
min. low q (1st q), median (2nd q), high q (3rd q), and max
What is 30% of 250?
75
A spinner has 5 equal sections labeled A, B, C, D, E.
After 50 spins, it lands on A 20 times.
Theoretical: 1/5
Experimental: 20/50
Rolling a dice and landing on 4.
If you were to do this 12 times, what is the theoretical probability of landing on the 4.
1/6 x 12 = 2
wo classes took the same test.
Class A scores: 70, 75, 80, 85, 90
Class B scores: 60, 70, 80, 90, 100
Which class has greater variability?
Class B. (Class B has a bigger range)
A die is rolled twice.
What is the probability of getting an even number both times?
3/6 x 3/6 = 9/36
A car travels 5/6 mile in 1/3 hour.
What is the speed in miles per hour?
15/6 or 2 3/6 or 2 1/2 or 2.5
A spinner has 4 equal sections: red, blue, green, yellow.
A coin is flipped.
What is the probability of landing on red AND heads?
1/8
A spinner has 5 equal sections: 2 red, 3 blue.
A coin is flipped.
What is the probability of landing on blue AND tails?
3/10
Class A quiz scores:
80, 82, 85, 87, 90
Class B quiz scores:
70, 75, 85, 95, 99
Which class has the greater variability?
Class B
A bag has 3 red and 7 black marbles.
What is the probability of drawing two black marbles in a row without replacement?
7/10 times 6/9 = 42/90
Mrs. Johnson predicted there would be 145 marbles in the jar. There were ACTUALLY 220. What is her percent error?
(estimated-actual)/actual times 100= percent error
34% error
A spinner has 8 equal sections: 3 red, 3 blue, 2 yellow.
A coin is flipped and a die is rolled.
👉 What is the probability of red AND NOT heads AND a number greater than 4?
6/96
A spinner has 6 equal sections numbered 1–6.
A coin is flipped and a die is rolled.
What is the probability of spinning a 2 AND tails AND rolling a 5?
1/72
Every 10th student entering the school building is surveyed about school spirit.
Biased or unbiased?
unibased
A bag contains 4 green marbles and 6 yellow marbles.
What is the probability of drawing two marbles, both being green, without replacement?
4/10 times 3/9
12/90
1/3(6x+12)-3x
-x+4