Question

Find the missing probability in the table below.

X 1 2 3 4
P(X) 0.30 0.40 0.15 ?
Never mind I solved it. :3

Answer 1

The missing probability is 0.15

Step-by-step explanation

From the given probability distribution table.

P(1)=0.30

P(2)=0.40

P(3)=0.15

P(4)=?

For for this to represent a probability distribution function,then the sum of all the probabilities must be equal to 1.

P(1)+P(2)+P(3)+P(4)=1

This implies that,

0.30+0.40+0.15+P(4)=1

0.85+P(4)=1

P(4)=1-0.85

P(4)=0.15

Therefore the missing probability is 0.15