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| var studentGrades = _.pluck(studentsByClass["A"], 'grades') | |
| // [[7.0, 6.9, 8.0], [5.0, 8.7, 3.7]] - not very useful | |
| var grades = _.flatten(studentGrades) | |
| // [7.0, 6.9, 8.0, 5.0, 8.7, 3.7] | |
| average(grades) | |
| // 6.55 |
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