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Mean average of 175, 550, 750 & 1100 (175+550+750+1100)/4 = 643.75
It means 4 atoms of Hydrogen.
75% of 750= 75% * 750= 0.75 * 750= 562.5
52% of 750= 52% * 750= 0.52 * 750= 390
65% of 750 65% * 750 .65 * 750 487.5.