EBook Problems Distrib RV

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EBook Problems Set - Random Variables

Problem 1

The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour:

Repair calls 0 1 2 3
P(x) 0.1 0.3 0.4 0.2

The probability that the number of repair calls is at least 2 is:

  • Choose one answer.
(a) 0.8
(b) 0.2
(c) 0.4
(d) 0.6


Problem 2

In a litter of seven kittens, three are female. You pick two kittens at random. The probability model for the number of male kittens is:

Number males 0 1 2
Probability 0.143 0.571 0.286

The expected number of males is:

  • Choose one answer.
(a) 0.64
(b) 1.7
(c) 1.14
(d) 2.1





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