Question

The mean of two samples sized 50 and 100 are 54.1 and 50.3 respectively. The standard deviation of these sample are 8 and 7 respectively. What will be the value of combined mean and standard deviation?

A Mean is 50 and standard deviation is 7.5
B Mean is 51.57 and standard deviation is 7.5
C Mean is 52.2 and standard deviation is 7.5
D Mean is 52.2 and standard deviation is 8
E Mean is 54.1 and standard deviation is 8
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