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18. Find the variance and standard deviation for the following frequency distribution of hours studied during a particular week by the 40 students in a statistics course: X fx X-Sq fX-Sq Variance Standard Deviation 10 100 100 EFX? 52 - X2 S 0 81 0 N N 16 64 128 49 196 X = a score value 36 252 S = a score frequency O - NWA LOV DO 10 0 - NAWU- JANO - 25 275 N = number of cases 16 80 X = mean of the simple frequency distribution 27 16 2 0 Variance = 1,076 - (4.75) Standard Square Root of 1,076 40 Deviation ~ the Variance = 26.90 - 22.56 = Square Root of 4.34 X _ _xx = 4.34 = 190 = 4.75 = 2.08 N 40