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Probability refresher Flashcards | StudBud
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Probability refresher
Probability refresher
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1
A lock has a 4-digit code (0, 1, 2, 3, 4 or 5). How many codes are possible if 1st digit is 5 AND no digit is repeated?
1 + 5 + 4 + 3 = 13
6 X 5 X 4 X 3 = 360
1 X 5 X 4 X 3 = 60
2
There are 10 marbles in a bag: 8 are blue, and 2 are red. What is the probability that a blue marble gets picked?
There is no chance, its impossible
50/50 (50%)
2/10 (20%)
8/10 (80%)
3
AND means multiply the possibilities and OR means add the possibilities
False
True
4
A letter is selected at random from the word STATISTICS. Find the probability that the letter is an S or T:
60%
70%
40%
50%
5
The probability of an event happening = The number of possibilities / the number of ways it can happen
False
True
6
What are the chances of rolling a "4" with a die
1/10 (10%)
1/2 (50%)
1/4 (25%)
1/6 (16.7%)
7
A code has 1 letter from the alphabet and 3 different digits from 0-9. How do we calculate how many codes are possible?
26 + 10 + 9 + 8
26 X 10 X 9 X 8
8
If one task can be accomplished in m ways and a second task can be accomplished in n ways… then…
The first task (and) the second task can be accomplished in (m + n) ways
The first task (and) the second task can be accomplished in (m x n) ways.
9
The probability line ranges from:
1 - 2
1 - 10
0 - 5
0 - 1
10
If one task can be accomplished in m ways and a second task can be accomplished in n ways… then…
The first task OR the second task can be accomplished in (m + n) ways
The first task OR the second task can be accomplished in (m x n) ways
