Four in ten Americans who travel by car look for gas and food outlets that are close to or visible from the highway. Suppose a random sample of n = 20 Americans who travel by car are asked how they determine where to stop for food and gas. Let x be the number in the sample who respond that they look for gas and food outlets that are close to or visible from the highway.
Calculate the mean of x.
______________
Calculate the variance of x.
______________
Calculate the interval 
.
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What values of the binomial random variable x fall into this interval?
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Find 
.
______________
How does this compare with the fraction in the interval 
for any distribution? For mound-shaped distributions?
________________________________________________________
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