What's the Kennection? #7

Welcome to the all-new edition of Kennections, a weekly quiz created by Jeopardy! champion/co-host Ken Jennings. Here's how to play: All five answers to the questions below have something in common. Can you figure it out?

1. Which Greek letter is used in math to symbolize standard deviation or summation?

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2.  With only 18 lines of dialogue, what Sleeping Beauty title character is the least chatty Disney princess?

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3.  What does Amistad, the name of the famed slave revolt ship, mean in Spanish?

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4.  What was the first mechanical slot machine, named for an American symbol once located in a Philadelphia steeple?             

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5.  In Braveheart, when asked to submit with the word “Mercy,” what last word does William Wallace shout instead?

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