Assume that the speed of automobiles on an expressway during rush hour is normally distributed with a mean of 62mph and a standard deviation of 10 mph. If 300 cars are selected at random, how many will be traveling slower than 45 mph? Of the 300 cars, approximately _ cars will be traveling slower than 45 mph.
(Round to the nearest whole number as needed)

Asmall (but heavy) particle placed in a glass of water will follow a zigzag motion because the particle will bounce off of the water molecules it meets. this is called brownian motion. a physicist simulates this on a computer, by varying the distance a particle can travel (called the mean free length), on average, before it collides with a water molecule and assigning the change in motion to be one of 8 directions, each with a similar probability. by running the simulated particle (with the same mean free length) many times she determines that it should take 15 seconds, on average, for the particle to fall to the bottom, with a standard deviation of 1.5 seconds. next she lets a real particle fall through a glass of water and finds that it took 18 seconds. what does she conclude, and why?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Which inequalities can be used to find the solution set of the following inequality? check all that apply. |2x – 5| (2x – 5) (2x + 5) –(2x – 5) –(2x + 5)