The given problem describes a binomial distribution with p = 60% = 0.6. Given that there are 400 trials, i.e. n = 400.
a.) The mean is given by:

The standard deviation is given by:

b.) The mean means that in an experiment of 400 adult smokers, we expect on the average to get about 240 smokers who started smoking before turning 18 years.
c.) It would be unusual to observe <span>340 smokers who started smoking before turning 18 years old in a random sample of 400 adult smokers because 340 is far greater than the mean of the distribution.
340 is greater than 3 standard deviations from the mean of the distribution.</span>
Answer:
I assume you meant 4x^2
So the answer in simplified form is -4x^2-11x+3
Answer:
B.
Step-by-step explanation:
f(x) has two complex roots and one real root.
It is 120 because you have to divide 210 by 7 which is 30 then multiply by 4 so 30 x 4 = 120.