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There Are Three Children in a Room, Ages 3, 4

Question 1

Multiple Choice

There are three children in a room, ages 3, 4, and 5. If another 4-year-old enters the room:


A) the mean age will stay the same, but the variance will increase.
B) the mean age will stay the same, but the variance will decrease.
C) the mean age and variance will stay the same.
D) the mean age and variance will increase.

Correct Answer:

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