A high school math class has 28 students: 18 seniors and 10 juniors. What is the probability that four randomly selected students will be seniors?

The probability that all four selected students are seniors is (18/28) × (17/27) × (16/26) × (15/25), since the selections are made without replacement. This is about 0.149, which rounds to 0.15, so the correct choice is 0.15.

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