Bunuel wrote:

At 3 pm, Jennifer went into labor. There is a 70% chance her baby will be born each hour that she is in labor. What is the probability that her baby will be born at 6 pm on the same day?

(A) 0.027

(B) 0.063

(C) 0.147

(D) 0.27

(E) 0.343

If the probability that the baby is born in an hour is 0.7(70%),

then the probability that the baby is not born in that hour is 0.3

If the baby is to born at 6, the baby can't be born at 4 or 5,

but must definitely be born at 6.

The probability that the baby is born at 6 is \(0.3*0.3*0.7 =\)

0.063(Option B)
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