diff --git a/lib/event.rb b/lib/event.rb
new file mode 100644
index 0000000..f7d8414
--- /dev/null
+++ b/lib/event.rb
@@ -0,0 +1,34 @@
+class Event
+  attr_reader :name, :ages
+
+  def initialize(name, ages)
+    @name = name
+    @ages = ages
+
+
+  end
+
+  def max_age
+    @ages.max
+  end
+  def min_age
+    @ages.min
+  end
+
+  def average_age
+    ages_sum = @ages.sum.to_f
+    num_of_ages = @ages.count.to_f
+    ages_sum / num_of_ages
+  end
+
+  def standard_deviation_age
+    average_age = self.average_age
+
+    @ages.map! do |age|
+      (((age.to_f) - average_age.round(1))**2).round(2)
+    end
+
+    standard_deviation = (Math.sqrt(((ages.sum.round(1)) / 5).round(2))).round(2)
+    return standard_deviation
+  end
+end
diff --git a/lib/runner.rb b/lib/runner.rb
new file mode 100644
index 0000000..3bcca5e
--- /dev/null
+++ b/lib/runner.rb
@@ -0,0 +1,34 @@
+require './lib/event'
+require './lib/games'
+# 20.times(print "-")
+puts "Welcome! Tell me the year of the event you are inquiring about?"
+print "> "
+year = gets.chomp
+
+new_olympics = Games.new(year)
+
+puts "Great! Now let's add some events! Enter 'Exit' to quit."
+
+event_input = ""
+ages = []
+
+loop do
+  puts "Add another event? Use 'Exit' to quit."
+  print "> "
+  event_input = gets.chomp.capitalize
+  if event_input == "Exit"
+       puts "Thanks, let's move on."
+       break
+  end
+  loop do
+    puts "I also need to know their ages, say 'Next' to enter next event."
+    print "> "
+    age_input = gets.chomp.capitalize
+    if age_input == "Next"
+      break
+    end
+    ages << age_input
+  end
+  new_event = Event.new(event_input, ages)
+  new_olympics.add_event(new_event)
+end
diff --git a/lib/standard_deviation.rb b/lib/standard_deviation.rb
index e17b03a..68a6edf 100644
--- a/lib/standard_deviation.rb
+++ b/lib/standard_deviation.rb
@@ -1,5 +1,21 @@
 ages = [24, 30, 18, 20, 41]
 
-# Your code here for calculating the standard deviation
+ages_sum = ages.sum.to_f
+num_of_ages = ages.count.to_f
+average_age = ages_sum / num_of_ages
+
+ages.map! do |age|
+  (((age.to_f) - average_age.round(1))**2).round(2)
+end
+
+standard_deviation = (Math.sqrt(((ages.sum.round(1)) / 5).round(2))).round(2)
+
+p standard_deviation
+
+
+
+
+
+
 
 # When you find the standard deviation, print it out
diff --git a/test/event_test.rb b/test/event_test.rb
new file mode 100644
index 0000000..bfe295f
--- /dev/null
+++ b/test/event_test.rb
@@ -0,0 +1,41 @@
+require 'minitest/autorun'
+require 'minitest/pride'
+require './lib/event'
+
+class EventTest < Minitest::Test
+  def setup
+    @event = Event.new("Curling", [24, 30, 18, 20, 41])
+  end
+
+  def test_does_it_exist
+
+    assert_instance_of Event, @event
+  end
+
+  def test_does_event_have_attributes
+
+    assert_equal "Curling", @event.name
+    assert_equal [24, 30, 18, 20, 41], @event.ages
+  end
+
+  def test_find_max_age
+
+    assert_equal 41, @event.max_age
+  end
+
+  def test_find_min_age
+
+    assert_equal 18, @event.min_age
+  end
+
+  def test_find_average_age
+
+    assert_equal 26.6, @event.average_age
+  end
+
+  def test_find_standard_deviation_age
+
+    assert_equal 8.28, @event.standard_deviation_age
+  end
+
+end