The probability of picking an 's' in the word Mississippi is 100% - you will always find one ... eventually.
However if you mean with single choice from the 11 characters of the word Mississippi, then the probability is 4 chances in 11 which is just over 36% or a probability of 0.363636 recurring.
My odd answer illustrates the need to pose questions without ambiguity.
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Since there are four 5's in a deck of 52 cards, the probability of picking a 5 from a deck of 52 cards is 4 in 52, or 1 in 13, or about 0.07692.
1/6 if the letter is chosen at random.
You have a total of 11 letters in "mathematics" and you have 4 vowels (a,e,a,i) so the probability of drawing a vowel is 4/11. In other words if you were to consider the vowel's to be 1's and the consonants 2's. What is the probability of drawing a "1". There would be 4 1's and 7 2's. It would be 4/11
What_is_the_probability_of_spinning_a_free_on_one_spin_and_an_s_on_your_second_if_you_have_a_spinner_with_1_space_labeled_free_and_the_remaining_11_mississippi_with_one_letter_in_each.So, you would multiply 1/12 times 4/12 to get 4/144 or 1/36
There are no s's in a standard deck of cards, so the probability of selecting any s's, in any sequence of draws, in any strategy of replacement is exactly zero.