What is the standard deviation for cylinders with problem


When a 4-cylinder car is brought in for a tune up the number of cylinders that have low compression is between 0 and 4. The table below shows the probabilities for each

X 0 1 2 3 4
f(x) 0.80 0.10 0.05 0.03 0.02

a) For a random car, what is the probability it will have any cylinders with low compression?

b) For a random car, how many cylinders do you expect to have a problem?

c) What is the standard deviation for cylinders with a problem?

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Mechanical Engineering: What is the standard deviation for cylinders with problem
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