Refer to the Scientific American (July 2003) report on whether bottled water is really purified water, Exercise 4.29. Recall that the Natural Resources Defense Council found that 25% of bottled water brands fill their bottles with just tap water. In a random sample of 65 bottled water brands, is it likely that 20 or more brands will contain tap water? Explain.

Data from Exercise 4.29

Is the bottled water you’re drinking really purified water? A 4-year study of bottled water brands conducted by the Natural Resources Defense Council found that 25% of bottled water is just tap water packaged in a bottle. (Scientific American, July 2003.) Consider a sample of five bottled water brands, and let Y equal the number of these brands that use tap water.