Answer:
Step-by-step explanation:
The median of the four numbers a, b, c and d. Where a ≤ b ≤ c ≤ d:
We have
84in², 72in², 80in², 84in² → 72in², 80in², 84in², 84in²
The median:
-12+5x=-24+x
4x=-12
x=-3
let thanh age be x
xuyen age= 22
therefore= (X-10)2=22
=2x-20=22
=2x=44
x=22
thanh age is 22