Many decades ago, the astronomers on the staff of mount wilson and palomar observatories each received about 60 nights per year for their observing programs. today, an astronomer feels fortunate to get 10 nights per year on a large telescope. can you suggest some reasons for this change?

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?