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All of the following, except one, are reasons for selecting a sample instead of stuying the whole population. Which one?
a) the cost of studying an entire population can be too high.
b) the population can be destroyed in the process of studying it.
c) the study of a population can be too time consuming.
d) sample results have a greater degree of accuracy than population results
All of the following, except one, are reasons for selecting a sample instead of stuying the whole population. Which one?
a) the cost of studying an entire population can be too high.
b) the population can be destroyed in the process of studying it.
c) the study of a population can be too time consuming.
d) sample results have a greater degree of accuracy than population results
Hi, grauperax!Quote:
Originally Posted by grauperax
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The average monthly gasoline purchase for a family with 2 cars is 80 gallons. This statistic has a normal distribution with a standard deviation of 15 gallons. A family with two cars is chosen at random.
(a) Find the probability that the family's monthly gaoline purchases will be between 75 and 85 gallons.
(b) Find the probability that the family's monthly gasoline purchases will be less than 75 gallons.
(c) Find the probability that the family's monthly gasoline purchases will be more than 85 gallons.
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