Question

Determine the required value of the missing probability to make the distribution a discrete probability distribution

P(4)=____
X P(x)
3 0.25
4 ?
5 0.39
6 0.15

Answer 1

Answer: 0.21

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Step-by-step explanation:

All of the values in the P(x) column must add to 1.

The value 1 in probability means 100%

Let y be the missing value in the table

0.25+y+0.39+0.15 = 1

y+0.79 = 1

y = 1-0.79

y = 0.21

The probability that x = 4 is 0.21

In other words, P(4) = 0.21

Or that we have a 21% chance of having x = 4 happen.