Question

There are 10 mechanical machines in the workshop. The chance of a broken device is 5%....

There are 10 mechanical machines in the workshop. The chance of a broken device is 5%.
a. Calculate the probability that there is no broken device.
b. What is the average number of broken machines?
c.Knowing that there is at least 1 broken device, calculate the probability that the number of broken machines is no more than 2.

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

a)

Let X denote the number of broken devices in the workshop. Then ​​​​​​

​​​​​​

Required probability =

b)

Let X denote the number of broken devices in the workshop. Then ​​​​​​

So, required average =

c)

Required probability =

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