3. Determine whether each of the distributions given below represents a probability distribution. Justify answer
a) x |1 | 2 | 3 | 4
P(x) |1/8| 1/8| 3/8 | 1/8
b) x | 20 | 30| 40 | 50
P(x)| 0.3|0.2| 0.1| 0.4
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The sum of probabilities must be equal to 1.
In the first "distribution" the sum is , so isn't a distribution.
In the second the sum is equal to 1, so it is a corect distribution.
There are two requirements: and .
Now you check both of those for these properties.
EDIT: What is the point of simply handing out simple answers?
Is that what teaching has come to?
Hello, Harry! 3. Determine whether each of the distributions given below represents a probability distribution. No . . . The probabilities do not add up to .
Yes . . . The probabilities are positive and add up to .
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