O location O center Question 12 1 pts Assume that length of adult female manatee follows symmetric and unimodal distribution with the mean of 10 feet and the standard deviation of 0.7 feet. According to the empirical rule, if there are 200 randomly caught adult female manatees, how many of them are between 9.3 and 10.7 feet? 136 Ces 95 O 68 190 D Question 13 1 pts Suppose that you want to test the effect of salinity on growth of sea oats. You use three levels of salinity 5 ppt, 10, ppt, and 20 ppt to grow sea oats. At the end of the experiment, you record whether plants survived and measure height of all survived plants. Then you compare the height by salinity level. In this example, the explanatory variable is: O Survival of sea oats. O Height of sea oats. Sea oats. Salinity level. D Question 14 1 pts X N P W