Suppose it is known that 80% people own a cellphone. If a random sample of 100 people were surveyed, a) what is the mean and standard deviation of the sample proportion? b) what is the probability that the proportion of the sample who owned a cellphone is greater than 83% c) what is the probability that the proportion of the sample who owned a cellphone is between 78% and 84?
Suppose it is known that 80% people own a cellphone. If a random sample of 100 people were surveyed, a) what is the mean and standard deviation of the sample proportion? b) what is the probability that the proportion of the sample who owned a cellphone is greater than 83% c) what is the probability that the proportion of the sample who owned a cellphone is between 78% and 84?
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Suppose it is known that 80% people own a cellphone. If a random sample of 100 people were surveyed,
a) what is the mean and standard deviation of the sample proportion?
b) what is the probability that the proportion of the sample who owned a cellphone is greater than 83%
c) what is the probability that the proportion of the sample who owned a cellphone is between 78% and 84?
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