In part (b) we obtained the following sampling distribution:

0 | .5 | 1 | 2.5 | 3 | 5 | |

P( = ) | 1/9 | 2/9 | 1/9 | 2/9 | 2/9 | 1/9 |

Since this is the same as the expected value of X, it follows that is an unbiased estimator of .

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