Suppose that 30% of students prefer to write with a mechanical pencil. suppose we sample students, one at a time, and stop as soon as we have selected one who prefers to write with a mechanical pencil. the probability that we will select 2 or fewer students is

Question

Mathematics

Cade Walter

10 September, 11:11

Suppose that 30% of students prefer to write with a mechanical pencil. suppose we sample students, one at a time, and stop as soon as we have selected one who prefers to write with a mechanical pencil. the probability that we will select 2 or fewer students is

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Case Oconnor · Answer 1

Probability that first student prefers mechanical pen = 0.30

P (first student does not and second student does) = 0.70 * 0.3 = 0.21)

P (selecting 2 or fweer) = 0.30 + 0.21) = 0.51 or 51%