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

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.