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 Solution Find missing frequency, {18,14,15,19,15,a,12,15,16},mean=16Solution:Your problem -> missing frequency, {18,14,15,19,15,a,12,15,16},mean=16Here 18,14,15,19,15,a,12,15,16Here Mean bar x = 16 and n = 9sum x = 18 + 14 + 15 + 19 + 15 + a + 12 + 15 + 16=a + 124Mean bar x = (sum x)/n16 = (a + 124)/9144 = a + 124a = 144 - 124a = 20 Solution provided by AtoZmath.com Any wrong solution, solution improvement, feedback then Submit Here Want to know about AtoZmath.com and me