Ononot — A school has three class sections: X, Y, and Z. The number o

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A school has three class sections: X, Y, and Z. The number of students in these sections are in the ratio $2:3:5$ , respectively. The mean scores on a standardized test for sections X, Y, and Z are $80$ , $70$ , and $85$ respectively. Which of the following statements about the combined group of students is/are correct?