Which one of the following numbers can be remove from the set S = { 0, 2, 4, 5, 9} without changing the average of the elements of the set S ?
2
5
9
4
None of them
Description (বিবরণ) :
প্রশ্ন: Which one of the following numbers can be remove from the set S = { 0, 2, 4, 5, 9} without changing the average of the elements of the set S ?
ব্যাখ্যা: he average of the elements in the original set S is:
(0 + 2 + 4 + 5 + 9)/5 = 20/5 = 4
If we remove an element that equals the average, then the average of the new set will remain unchanged. The new set after removing 4 is {0, 2, 5, 9}.
The average of the elements is,
(0 + 2 + 5 + 9)/4 = 16/4 = 4
