What is the second step in calculating the mean? divide multiply

After you summed all the numbers, you'll have to divide the answer by the number of numbers summed, to obtain the final answer (mean, average).

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the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.