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In a large class, the professor has each person toss a coin several times and calculate the proportion of his or her tosses that were heads. The students then report their results, and the professor plots a histogram of these several proportions. If the students toss the coin 100 times each, about 95% of all these samples should have sample proportions between what two numbers?
Use the 68-95-99.7 Rule to provide the appropriate response.