descriptive statistics

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?.
my problem is not understanding what is the requested in the question!!


Omega Contributor
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.