Please find the variance in que 16. My ans is not matching

height(in cm) No.of students fi xi straight u subscript straight i equals fraction numerator straight x subscript straight i minus 154 over denominator 4 end fraction fiui ui2 fiui2
136-140 3 138 -4 -12 16 48
140-144 8 142 -3 -24 9 72
144-148 15 146 -2 -30 4 60
148-152 19 150 -1 -19 1 19
152-156 35 154 0 0 0 0
156-160 27 158 1 27 1 27
160-164 20 162 2 40 4 80
164-168 9 166 3 27 9 81
168-172 4 170 4 16 16 64
  straight N equals sum from blank to blank of straight f subscript straight i equals 140     sum from blank to blank of straight f subscript straight i straight u subscript straight i equals 25   sum from blank to blank of straight f subscript straight i straight u subscript straight i squared equals 451
begin mathsize 20px style Here space straight A equals 154 comma space straight h equals 4 Mean equals straight A plus straight h open parentheses 1 over straight N sum from blank to blank of straight f subscript straight i straight u subscript straight i close parentheses equals 154 plus 4 open parentheses 25 over 140 close parentheses equals 154.71 Var left parenthesis straight X right parenthesis equals straight h squared open square brackets 1 over straight N sum from blank to blank of straight f subscript straight i straight u subscript straight i squared minus open parentheses 1 over straight N sum from blank to blank of straight f subscript straight i straight u subscript straight i close parentheses squared close square brackets equals 4 squared open square brackets 451 over 140 minus open parentheses 25 over 140 close parentheses squared close square brackets equals 16 open parentheses 3.22 minus 0.03 close parentheses equals 51.04 end style

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