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`        The mean and variance from a group of 80 observations are 63.2 and 25.93 respectively. If 60 of these observations have nean 64.8 and SD=4 find mean and SD of remaining 20`
2 years ago

Arun
24739 Points
```							Dear AkashFor meanTotal = 80 * 63.2 = 5056Sum of 60 = 60* 64.8 = 3888Sum of remaining 20 = 5056-3888 = 1168HenceMean of remaining 20 = 1168/20 = 58.4 RegardsArun (askIITians forum expert)
```
2 years ago
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