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int n；

sum = 0；

scanf("%d "，& ampn)； //Note that the input value of n should be less than the array length you defined.

for(I = 0； I & ltn；; i++)

scanf("%f "，& ampa[I])；

for(I = 0； I & ltn；; i++)

sum = sum+a[I]；

m = sum/n；

printf("%.2f "，m)； The .2 in //%.2f can control the output to keep two decimal places.