A traffic engineer records a sample of the types of vehicles that cross a bridge. she counts 112 passenger cars, 18 light trucks, and 20 heavy trucks. she wants to make a spinner to model the probability of each type of vehicle crossing the bridge. Determine the percent of each sector of the spinner to the nearest percent. To the nearest tenth of a percent, what is the probability that at a given moment, a light truck crosses the bridge followed by a heavy truck?

Question

Mathematics

Bradley Skinner

Today, 02:56

A traffic engineer records a sample of the types of vehicles that cross a bridge. she counts 112 passenger cars, 18 light trucks, and 20 heavy trucks. she wants to make a spinner to model the probability of each type of vehicle crossing the bridge. Determine the percent of each sector of the spinner to the nearest percent. To the nearest tenth of a percent, what is the probability that at a given moment, a light truck crosses the bridge followed by a heavy truck?

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Gordon Hoover · Answer 1

112 + 18 + 20 = 150 total vehicles

112/150 = 0.746 = 74.6% rounds to 75% passenger cars

18/150 = 0.12 = 12% light trucks

20/150 = 0.133 = 13.3% rounds to 13% heavy trucks

P (light truck followed by heavy truck) = 18/150 * 20/149 = 12/745 or 1.6% ... I am not 100% sure on this 2nd part