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Measurement error that is continuous and uniformly distributed from –3 to +3 millivolts is added to...

Measurement error that is continuous and uniformly distributed from –3 to +3 millivolts is added to a circuit’s true voltage. Then the measurement is rounded to the nearest millivolt so that it becomes discrete. Suppose that the true voltage is 250 millivolts. (a) What is the probability mass function of the measured voltage? (b) What are the mean and variance of the measured voltage?

I have solved A and B.

However my professor wants us to do the following: In addition, draw a sketch of the probability density function.

I am not sure how to do this. Do I used the PDF formula with the value I obtained for the Mean and Variance? Thanks.

math   Statistics-And-Probability   
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