Table 1
Table 2
Table 3
Word Probs 1
Word Probs 2
100
Find P(Grades and Girl)
0.272
100
If we were to select someone at random from this survey, what is P(college)?
0.287
100
A high school teacher surveyed 500 freshmen and sophomore students to see whether they preferred Algebra or Geometry. Complete the two way table given the following info:
- Out of all the freshmen surveyed, 40% said they preferred Algebra.
- Out of all the students surveyed, 56% said they preferred Geometry.
104 156 260
116 124 240
220 280 500
100
In your dresser are five black socks, seven white socks, and three brown socks. What is the probability that a randomly selected sock is not white?
0.53
100
Your friends created a playlist for a party this weekend. It has many hundreds of songs. You figure that roughly 65% of the songs are rap, 25% of the music is pop, and the rest is techno. When the party starts, you put the playlist on shuffle and listen to whatever randomness it produces. What is the probability that the first song is:
Not a rap song?
0.35
200
Find P(Sports or Boy)
0.538
200
What is P(USA | post-graduate?
0.333
200
P (sophomore and Geometry)?
0.248
200
Eighty percent of Americans like to watch NFL, and 30% of Americans like to watch NBA, while 35% enjoy watching both. What is the probability that a randomly selected American either enjoys watching NFL or NBA?
0.75
200
The probability of spinning a red is 0.20. The probability of rolling a prime number is 0.8. What is the probability of spinning a red or rolling a prime?
0.84
300
Find P(Girls | Grades)
0.526
300
Are China and college independent events? Explain
No P(china | college) does not equal P(china)
OR
No P(china) x P(college) does not equal P(china and college)
300
P (Sophomore or Geometry)?
0.792
300
An online retailer conducts a random survey of its customers. The survey shows that 90% of the customers receive their purchases within four days, and 82% of those customers are satisfied with the quality of their purchases.
What percent of all customers receive their purchases within four days and are not satisfied with the quality of their purchases?
16%
300
Two events, A and B, are independent. P(B) = 0.8 and P(A and B) = 0.48. What is P(A)?
0.6
400
Are being a girl and wanting to get good grades independent? Explain
No because P(girl | grades) does not equal P(girl)
OR
No because P(girl) x P(grades) does not equal P (girl and grades)
400
Find P(amusement park | 12th grade)
0.48
400
P (Sophomore | Geometry)?
0.443
400
Events A and B are independent. P(A and B) = 0.35. What are possible probabilities for events A and B?
Any combination that multiples to equal 0.35
Example: 0.7 and 0.5, 0.35 and 1
400
P(A) = 0.3, P(B) = 0.6, and P(A and B) = 0.15. Are A and B independent events? Explain
No (0.3 x 0.6 does not equal 0.15)
500
FINAL JEOPARDY
Emily asks the students in her school whether they play a sport and maintain a 2.5 GPA. She studies the events shown.
- Event A: The student plays at least one sport.
- Event B: The student maintains at least a 2.5 GPA.
Emily finds that the two events are independent. Select all the equations that must be true for A and B.
bullets 2, 3, 6