Statistic in Ruby on Rails

I have the following problem, I need my system to generate some statistical data from a vector, for example:

vetor = [1, 5, 2, 1, 6, 30, 2, 7, 2, 80]

I need to extract some data from it, like:

• Medium

• Medium

• Fashion

• Minimum

• Maximum

• Standard deviation

I use rails in version 3.2.15.

My question is the following, do you know any gems that help me in this or will I have to do everything by hand?