If your sibling is of opposite sex, stay standing. Otherwise, sit down.

Do you predict half of them will stay standing? More than half? Less than half?

```
Fun: Ask all your students with exactly 1 sibling to stand. Ask each if their sibling is of opposite sex. If you're right they stay standing
```

— Max Ray (@maxmathforum)

```
@maxmathforum Do you predict half of them will stay standing? More than half? Less than half? #matharguments
```

— Max Ray (@maxmathforum)

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