Question: Calculate a mean for each group and a grand mean for these data from Exercise 12.21. 1970: 45, 211, 158, 74 1980: 92, 128, 382

Calculate a mean for each group and a grand mean for these data from Exercise 12.21.

1970: 45, 211, 158, 74 1980: 92, 128, 382 1990: 273, 396, 178, 248, 374

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