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-year's, or 30.9 trillion kilometers. 1000 800 600 Apparent velocity (kay's) 400 200 000 025 050 075 1,00 125 150 175 200 Distance (Moc) Raw data ShowMean 2 points possible (graded) First, calculate the sample mean: X = 1 IME N Xin where /V is the number of data points there, it is 24). To three significant figures, Mpc km/sStandard deviation 2 points possible (graded) Now, calculate the sample standard deviation: 1 N SX N-1 E ( x - 1). To three significant figures (beware that numpy sid defaults to the population standard deviation), Mpc km/s Seve You live used o of a attempts