Answer: 0.6274
Step-by-step explanation:
Given: The proportion of patients experience injection-site reactions with the current needle : p=0.11
Sample size : n= 4
Let x be a binomial random variable that represents the people get an injection-site reaction.
Binomial probability formula: 
The required probability : P(x=0)

Hence, the probability that none of the 4 people get an injection-site reaction = 0.6274
x = 0.7554, 1.3734, 3.927, and 4.515 Try That And See.
Answer:
7 / 10 < 11 / 12
Step-by-step explanation:
cross multiply
I think the right answer is c based on what I have learned