Roll 2 dice several times (v2)

dice2.rb

# Rolling a dice is equivalent to generating a random number from 1 to 6.
def dice_roll
	sum = 0
	2.times {
		sum += 1 + rand(6)
	}
	sum
end

puts "How many dice rolls?"
num_dr = gets.to_i

# <horrible code, need to replace this>
# The tally table that will be outputted. Minimum value when 2 die are rolled is 2, maximum is 12
tally = {}
tally[2] = 0
tally[3] = 0
tally[4] = 0
tally[5] = 0
tally[6] = 0
tally[7] = 0
tally[8] = 0
tally[9] = 0
tally[10] = 0
tally[11] = 0
tally[12] = 0
# </horrible code, need to replace this>

# Before we start, let's record the time.
start = Time.now

num_dr.times {
	result = dice_roll
	tally[result] += 1
}

# More code to replace after this.
puts '2: ' + tally[2].to_s
puts '3: ' + tally[3].to_s
puts '4: ' + tally[4].to_s
puts '5: ' + tally[5].to_s
puts '6: ' + tally[6].to_s
puts '7: ' + tally[7].to_s
puts '8: ' + tally[8].to_s
puts '9: ' + tally[9].to_s
puts '10: ' + tally[10].to_s
puts '11: ' + tally[11].to_s
puts '12: ' + tally[12].to_s
# /replace horrible code

# Lets check how much time it took as well
time_taken = (Time.now - start)
puts "Time taken: " + time_taken.to_s + " seconds."