when 9 students took zoology quiz with a possible score of 0 to 10, inclusive,the average (arithmetic mean) score is 7.5.if thenth student takes the same quiz,what will be the least possible average score for 10 students?
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sum of 9 students score =9×7.5
=67.5
mean for 10 students be 6.75
=67.5
mean for 10 students be 6.75
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