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1. Which of the following is correct about a probability distri

1. Which of the following is correct about a probability distri

1. Which of the following is correct about a probability distribution?

Answer

 

Sum of all possible outcomes must equal 1

 

Outcomes must be mutually exclusive

 

Probability of each outcome must be between 0   and 1 inclusive

 

All of the above

2.

For the following distribution

x P(x)

0 0.13

1 0.346

2 0.346

3 0.154

4 0.026

what is the mean distribution

A: 1

B: 2.5

C: 1.604

D: 3

3.

A machine shop has 100 drill presses and other machines in constant use. The probability that a machine will become inoperative during a given day is 0.002. During some days no machines are inoperative, but during some days, one, two, three or more are broken down. What is the probability that fewer than two machines will be inoperative during a particular day?

Answer

 

0.0200

 

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