The random variable X is normally distributed. The values 650 and 850 are at the 60th and 90th percentiles of the distribution of X, respectively.網站管理員2024-03-13T00:38:21+08:0013 3 月, 2024|
triangle ACE is similar to triangle BCD. The height of ACE corresponding to the base AE is 7, and the height of BCD corresponding to the base BD is k. The area of BCD is equal to the area of trapezoid ABDE.網站管理員2024-03-12T23:25:31+08:0012 3 月, 2024|
