The resistance of one meter of copper cable at a certain temperature is normally distributed with mean

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The resistance of one meter of copper cable at a certain temperature is normally distributed with mean μ = 23.8 and variance σ2 = 1.28.
(a) What is the probability that a one-meter segment of copper cable has a resistance less than 23.0?
(b) What is the probability that a one-meter segment of copper cable has a resistance greater than 24.0?
(c) What is the probability that a one-meter segment of copper cable has a resistance between 24.2 and 24.5?
(d) What is the upper quartile of the resistance level?
(e) What is the 95th percentile of the resistance level?
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