Question

四个数的算术平均数为 $85$ 。如果其中最大的数是 $97$ ，那么其余三个数的平均数是

The arithmetic mean (average) of four numbers is $85.$ If the largest of these numbers is $97,$ then the mean of the remaining three numbers is

$81.0$

$82.7$

$83.0$

$84.0$

$84.3$

知识点：平均数

四个数的和是 $4 \times 85 = 340$ ，所以其余三个数的和是 $340 - 97 = 243$ 。

它们的平均数是 $243 \div 3 = 81$ 。

所以正确答案是 A。

The four numbers sum to $4 \times 85 = 340,$ so the remaining three sum to $340 - 97 = 243.$

Their mean is $243 \div 3 = 81.$

Thus, the correct answer is A .