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Grade: 12th pass
        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

Answers : (1)

Arun
23041 Points
							
Dear Akash
For mean
Total = 80 * 63.2 = 5056
Sum of 60 = 60* 64.8 = 3888
Sum of remaining 20 = 5056-3888 = 1168
Hence
Mean of remaining 20 = 1168/20 = 58.4
 
Regards
Arun (askIITians forum expert)
2 years ago
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