Use Statistics to Get the Probability of a Sample Proportion

In a particular area ofthe Northeast,an estimated 75% ofthe homes use heating oil as the principal heating fuel during the winter.A random telephone survey of150 homes is taken in an attempt to determine whether this figure is correct.Suppose 120 ofthe 150 homes surveyed use heating oil as the principal heating fuel.What is the probability ofgetting a sample proportion this large or larger ifthe population estimate is true?

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