A student has heard that spinning pennies on a table, rather than flipping them in the air, results in tails side up 65 percent of the time. If this is true, what is the probability that a student who spins 4 pennies will have them all land tails side up?

Each penny has a 0.65 probability of landing tails side up. Assuming the spins are independent, the probability that all 4 land tails is 0.65 × 0.65 × 0.65 × 0.65 = 0.17850625, which rounds to 0.1785. The correct choice is 0.1785.

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