Two motorcycles, separated laterally by 7.28 m, are approaching an observer hold- ing an infrared detector that is sensitive to radiation of wavelength 930 nm. What aperture diameter is required in the detector if the two headlights are to be re- solved at a distance of 24.2 km? Answer in units of mm. 1 units of mm

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?