6/18= 1/3 a simplest fraction
Answer: 0.1334
Step-by-step explanation:
Given
There are seven trails with a probability of success is 

Using the binomial distribution, the Probability of exactly no success i.e. x=0 is given by

Answer:
mean= 90
Step-by-step explanation:
The mean is the terms added together, then divided by the number of terms (in this case, 8):

Done.
Ok, i really don't remember this, so i don't want to steer you wrong. maybe wait for another answer?