DESCRIPTIVE STATISTICS Summation of indexed data Ta The following is a list of 15 measurements. -90, 21, -80, -73, -66, 32, -92, 83, 52, 29, 73, 66, -61, -74, 76 Send data to calculator Send data to Excel Suppose that these 15 measurements are respectively labeled X], X2, ..., X15. (Thus, -90 is labeled x], 21 is labeled x2, and so on.) Compute the following. 15 2( x, -38) i = 1 X S