Rolling dice simulator with probability
For styling, variable naming etc. conventions, please take a look at PEP-8. Your globals should be UPPERCASED and function names should be snake_cased.

Since you are not at all interested in the rolled list, why store a thousand values in memory?

You should always seed when using a RNG function. For more information on why this practice is favoured, check this SO response.

Instead of using random.randrange, prefer using random.randint.

With those in place, you have:

import random
import operator

random.seed()

ROLLED = {i: 0 for i in range(1, 7)}
ITERATIONS = int(input('How many times would you like to roll the dice? '))

def probability():
    print("Calculation of probability: ")
    for key, count in ROLLED.items():
        print("\t{}: {:.2f}".format(key, count*100./ITERATIONS*1.))

for _ in range(ITERATIONS):
    ROLLED[random.randint(1, 6)] += 1

probability()


To find the most rolled, and least rolled face of the die, you can use a custom operator on ROLLED dictionary:

max(ROLLED.iteritems(), key=operator.itemgetter(1))
min(ROLLED.iteritems(), key=operator.itemgetter(1))