According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a) compute the mean and standard deviation of the random variable x, the number of smokers who started before 18 in 100 trials of the probability experiment. (b) interpret the mean. (c) would it be unusual to observe 85 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? why?

gregory's graph is incorrect because it shows 2 inches of growth for each week when it should show 0.75 inches of growth each week.

the answer is  

a.

4,624π mm2

step-by-step explanation:

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this

365

step-by-step explanation: