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Sagot :
[tex]\underbrace{90;\ 95;\ 85;\ 80;\ 85;\ 90;\ 80;\ 95;\ 100}_{9\ numbers}\\\\90+95+85+80+85+90+80+95+100=800\\\\therefore:\\the\ maean=\frac{90+95+85+80+85+90+80+95+100}{9}=\frac{800}{9}=88\frac{8}{9}\approx89[/tex]
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