Consider these two histograms representing two sets of data with 10 observations each. which of the following is true? a. the means are equal and the standard deviation of plot 1 is smaller than the standard deviation of plot 2. b. the means are equal and the standard deviations are equal. c. the mean and standard deviation of plot 2 are larger than the mean and standard deviation of plot 1. d. the means are equal and the standard deviation of plot 1 is larger than the standard deviation of plot 2.

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?

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

According to the data set, where should the upper quartile line of the box plot be placed?