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1. The mean of \(a\), \(b\), \(c\), \(d\) and \(e\) is \(28\). If the mean of \(a\), \(c\) and \(e\) is \(24\), then mean of \(b\) and \(d\) is .
2. If the mean of five observations \(x\), \(x + 2\), \(x + 4\), \(x + 6\), \(x + 8\) is \(11\), then the mean of first three observations is .
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