Suppose that 76% of americans prefer coke to pepsi. a sample of 80 was taken. what is the probability that at least seventy percent of the sample prefers coke to pepsi

The standard deviation of the sample proportion is:

The z-score for 0.7 is:

Reference to a standard normal distribution table shows that the probability that at least 70% of the sample prefers coke to pepsi is 0.8944 or 89.44%.

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