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Construct a probability distribution and calculate the mean and standard deviation. x01234Frequency3010532 First divide the frequencies by the sample size (n= sum of frequency column) to construct the probability distribution. x01234P(x)30/50=.610/50=.25/50=.13/50=.062/50=.04 Press STAT and then select EDIT (#1). Enter the random variable x in L1 and P(x) in L2 (you can enter the fractions in L2 and when you press enter the decimal will appear). To find the mean (expected value) and standard deviation, press the STAT key, highlight CALC using the arrow keys and then select the 1-VAR STATS option (#1). Then enter L1, L2. Remember L1 is x and L2 is P(x).  Press ENTER to view the descriptive statistics.  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