Seventy-five percent of adult smokers started smoking before turning 18 years old. If 20 adult smokers are randomly chosen, find the probability that at most 6 of them started smoking after they turned 18.
p = 0.75
n = 20
P(X = x) = 20Cx * 0.75x * (1 - 0.75)20-x
P(X < 6) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) + P(X = 5) + P(X = 6)
= 20C0 * 0.750 * 0.3520 + 20C1 * 0.751 * 0.2519 + 20C2 * 0.752 * 0.2518 + 20C3 * 0.753 * 0.2517 + 20C4 * 0.754 * 0.2516 + 20C5 * 0.755 * 0.2515 + 20C6 * 0.756 * 0.2514
= 0.000030
Seventy-five percent of adult smokers started smoking before turning 18 years old. If 20 adult smokers...
statistics question about smoking before 18 years of ageAccording to an almanac, 70% of adult smokers started smoking before turning 18 years oh When technology is used, use the Tech Help button for further assistance. (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 80 smokers who started smoking before turning 18 years old...
Need help statistics question about adult smokers According to an almanac, 80% of adult smokers started smoking before turning 18 years old. When technology is used, use the Tech Help button for further assistance. Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 200 trials of the probability experiment. Interpret the mean. Would it be unusual to observe 170 smokers who started smoking before turning 18 years old in...
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According to the Information Please Almanac, 80% of adultsmokers started smoking before turning 18 years old.a). Compute the mean and standard deviation of the randomvariable X, the number of smokers who started before 18 in 200trials of the probability experiment.b). Interpret the mean.c). Would it be unusual to observe 180 smokers who startedsmoking before turning 18 years old in a random sample of 200 adultsmokers? Why?
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