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7. On a group trip to a certain city, 20 people who were 25 years...

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7. On a group trip to a certain city, 20 people who were 25 years old, 20 people who were 30 years old, and 20 people who were 35 years old purchased tickets for a bus tour of the city. No one else purchased tickets for the bus tour. A 30-year old who had purchased a ticket became ill and did not go on the bus tour, and everyone else who purchased a ticket went on the bus tour. Which of the following statements is true? (A) The standard deviation of the ages of the people who went on the bus tour is greater than the standard deviation of the ages of the people who purchased tickets. (B) The standard deviation of the ages of the people who went on the bus tour is less than the standard deviation of the ages of the people who purchased tickets. (C) The standard deviation of the ages of the people who went on the bus tour is equal to the standard deviation of the ages of the people who purchased tickets. (D) There is not enough information to determine which standard deviation is greater.

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