Assume the resistance of a certain type of resistor is normal distrubuted random

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Assume the resistance of a certain type of resistor is normal distrubuted random variable with mean =12.8 ohms and standard diviation of =1.3ohms

a) if a single reistor is to be randomly selected from the process producing resistors , what is the probability that the single resistor will have a resistance that is less than 11 ohms?

b) if a random sample of four resistor is to be randomly selected from the process producing resistors, what is the probabily the sample mean will have a resistance that is less than 11 ohms?

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