A computer is programmed to make 100 draws at random with replacement from a box containing 5 tickets: 1 labeled 1, and 4 labeled 0, and to then take the sum of these 100 draws. It does this task 144 times, and the average of the 144 sums is 21.13. Is the program working ok, or is something wrong with it? Make a decision by carrying out a one-sample z test. (You will need to think carefully about what the box model looks like if the program is working ok.)

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