WorksheetsSTT - Introduction to Probability
Total questions: 9
Worksheet time: 7mins
How are you?
A Pew Research poll in 2011 asked 2005 US adults whether being a parent today is harder than it was a generation ago. Here are the results:
Easier = 501
Same = 802
Harder = 682
No Opinion = 20
If you randomly select one person from this sample of 2005 adults, what's the probability that the person responded "Easier"?
0.2499
0.2491
0.6247
0.7346
A Pew Research poll in 2011 asked 2005 US adults whether being a parent today is harder than it was a generation ago. Here are the results:
Easier = 501
Same = 802
Harder = 682
No Opinion = 20
If you randomly select one person from this sample of 2005 adults, what's the probability that the person responded "Easier" or "Same"?
0.6499
0.4000
0.2499
0.39501
The big light in Boone (Wendy's intersection) has a 0.28 probability of being green. What does that mean?
In the long run, the traffic light will have a green light approximately 28% of the time. But for each time you enter the intersection, the outcome cannot be predicted.
In the long run, the traffic light will have a green light exactly 28% of the time. But for each time you enter the intersection, the outcome cannot be predicted.
In the long run, the traffic light will have a green light exactly 28% of the time. But for each time you enter the intersection, the outcome can only be predicted if all previous light results are known.
In the long run, the traffic light will have a green light approximately 28% of the time. But for each time you enter the intersection, the outcome can only be predicted if all previous light results are known.
The big light in Boone (Wendy's intersection) has a 0.28 probability of being green. What is the probability that the light is NOT green when you enter the intersection?
100%
28%
72%
Cannot be determined
The big light in Boone (Wendy's intersection) has P(Green) = 0.28 and we determine that the P(Yellow) = 0.04. What is the probability that the light is red?
0.32
0.68
0.73
Cannot be determined
We've determined the big light in Boone has
P(Green) = 0.28, P(Yellow) = 0.04, P(Red) = 0.68.
What's the probability that if you go through the intersection twice in one day, the light will be red BOTH times?
0.68
0.4624
0.1024
1.36
We've determined the big light in Boone has
P(Green) = 0.28, P(Yellow) = 0.04, and P(Red) = 0.68.
If you go through the intersection three days in a row (one time each day), what's the probability that the third day is the first time you encounter a red light?
6.96%
14.8%
31.4%
3.3%
We've determined the big light in Boone has
P(Green) = 0.28, P(Yellow) = 0.04, and P(Red) = 0.68.
If you go through the intersection every day of the week (7 days), what's the probability that you have to stop because the light is red at least once during the week?
6.72%
0.03%
99.97%
93.28%
