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Stats Quiz - Probability
Stats Quiz - Probability
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1
For a standard normal distribution, Find the 85th percentile.
1.95
2.01
1.04
2.55
2
Find the mean of this probability distribution.
4
2
1
3
3
Find the probability of obtaining a thermometer that reads less than 2.79°C.
0.9974
0.5484
0.1684
0.0026
4
Find the probability that a randomly selected student did NOT get an "C"
0.9989
0.3867
0.4998
0.5833
5
A bag of M&M's has 6 red, 2 green, 8 blue, and 3 yellow. Find probability of picking: a yellow.
0.0051
0.1579
0.6482
0.2866
6
A certain lightbulb lifetime is normally distributed (mean=6.3, stdev=1.6). Find P(x>3).
0.0196
0.7832
0.9804
0.2168
7
Two dice are rolled. What is the probability P(sum is 12)?
0.0278
0.0005
0.1333
0.0183
8
For a standard normal distribution, find:P(z < -1.77)
0.6548
0.0384
0.5021
0.8446
9
For a standard normal distribution, P(z < c) = 0.7554. Find c.
0.69
0.05
-0.63
1.53
10
Find the probability of selecting a thermometer that reads between -1.59°C and -1.46°C
0.8315
0.1685
0.9838
0.0162
11
Mean of 69.0 and a standard deviation of 2.8 . Find the z-score of 67.6.
-0.5
0.3
1.3
-2.7
12
Find P(3 or 10)
0.1667
0.6667
0.2703
0.1111
13
A company's items have normally distributed length (mean=8.1 std dev=1.2. Find P(x<11.5)
0.9977
0.8146
0.5315
0.2158
14
Find the probability of obtaining a thermometer that reads greater than -0.19°C.
0.3482
0.5753
0.4247
0.6518
15
Empty question
0.8850
0.1578
0.3158
0.558
16
48.3% of Americans believe in UFOs. Find the probability someone does not believe in UFOs.
0.369
0.517
0.1
0.483
17
For a standard normal distribution, find:P(z > -1.37)
0.8530
0.0853
0.8946
0.9147
18
Apples weights are normally distributed (mean=325g, stdev=25g). Find P(383<x<395)
0.1584
0.0076
0.8416
0.9924
19
Probability 2 randomly chosen people own a dog if 13% of people own dogs.
0.0849
0.26
0.1300
0.0169
20
An event is uniformly distributed between 9 and 16, Find probability between 12 and 15.
0.4286
0.2648
0.3658
0.3385
21
Find the probability that the student got a 'A' GIVEN they are female.
0.5486
0.2648
0.0896
0.1579
22
Empty question
2.5
3.7
4.5
1.1
23
Empty question
527
589
563
577
24
453 green peas and 146 yellow peas. Estimate the probability of getting a green pea.
0.3223
0.7563
0.7156
0.7955
25
For a standard normal distribution, find:P(-0.06 < z < 0.43)
0.2641
0.9251
0.5581
0.1903
