(Answered) Question the resistance for resistors of a certain type is

Statistics

Question: The resistance for resistors of a certain type is a random variable X having the normal distribution with mean 9 ohms and standard deviation 0.4 ohms. A resistor is acceptable if its resistance is between 8.6 and 9.8 ohms.

(a) What is the probability that a randomly chosen resistor is acceptable?

(b) What is the probability that out of four randomly and independently selected resistors, two are acceptable?

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