In the article "Viral load and heterosexual transmission of human immunodeficiency virus type 1" [New England Journal of Medicine (2000) 342:921-929], studied the question of whether people with high levels of HIV-1 are significantly more likely to transmit HIV to their uninfected partners. Measurements follow of the amount of HIV-1 RNA levels in the group whose partners who were initially uninfected became HIV positive during the course of the study: values are given in units of RNA copies/mL.
79725, 12862, 18022, 76712, 256440, 14013, 46083, 6808, 85781, 1251,
6081, 50397, 11020, 13633 1064, 496433, 25308, 6616, 11210, 13900
a. Determine the mean, median, and standard deviation.
b. Find the 25th, 50th, and 75th percentiles.
c. Plot the data in a boxplot and histogram.
d. Describe the shape of the distribution.