Answer: 4 out of 13
Step-by-step explanation:
Total letters in "MASSACHUSSETT " = 13
Number of S = 4
Probability of an event = [tex]\dfrac{\text{Favorable outcomes}}{\text{Total outcomes}}[/tex]
The probability of selecting the letter S = [tex]\dfrac4{13}[/tex] [already in lowest term as gcd(4,13)=1]
Hence, the probability of selecting the letter S = 4 out of 13.