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We want to know how many defective telephones there are in the test. The types of results we expect are presented below.
- In case 1 all three cellphones are defective. has value 3.
- In case 2, one cellphone is non defective and two are defective. has value 2.
- In case 3, two cellphones are non defective and one is defective. . has value 1.
- In case 4, all the three cellphones are non defectives. has value 0.
The random variable may take on the values 0,1,2,3
0 1 2 3