descriptive statistics

#1
the means of two samples of size 50 and 100 respectively are 45.1 and 50.3 and the standard deviations are 8 and 7. obtained the mean and standard deviation of the sample of size 150 obtained by combining the two samples?.
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my problem is not understanding what is the requested in the question!!
 

hlsmith

Omega Contributor
#2
It probably couldn't be any clearer. You have n-values and parameters for two datasets, what are the newly calculated parameters if you merge the two datasets together.