90.
90
It is 89
The median of those numbers is 90.
100
86
83.7
When the data is arranged in ascending order, the middle numbers are 88 and 90. Take the mean of these, which is 89, as the median.
The mean is 92.7, if I am not mistaken (the sum of the 10 numbers divided by 10). The median is 91.5 (halfway between 91 and 92, the two numbers in the middle). The mode is 90, the only number that occurs twice.
90
It is 89, the value halfway between the two middle values.
89
98 comes 10 after 88, 90 comes 2 after 88 and 89 comes 1 after 88.