this pulsation, and so the distance to any star of this type can be determined by how bright or dim it appears. The following figure shows his data. The Y-axis is the apparent velocity, measured in kilometers per second. Positive velocities are galaxies moving away from us, negative velocities are galaxies that are moving towards us. The X-axis is the distance of the galaxy from us, measured in mega-parsecs (Mpc); one parsec is 3.26 light-years, or 30.9 trillion kilometers. Raw data Apparent velocity (km/s) 1000 800 600- 400 200- 0: .. 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 Distance (Mpc) Show Mean 2 points possible (graded) First, calculate the sample mean: -M 8 where N is the number of data points (here, it is 24). To three significant figures, x= Y = km/s IM Standard deviation 2 points possible (graded). Now, calculate the sample standard deviation: 8X (x,- To three significant figures (beware that numpy std defaults to the population standard deviation), 8xm Mpc Sy Windows You have used 0 of 3 attempts km/s Savy