Here are five cards. 1 5 7 9 11 One of the cards is removed. The mean of the numbers on the remaining four cards is 6 Which card was removed
Here are five cards. 1 5 7 9 11 One of the cards is removed.
The mean of the numbers on the remaining four cards is 6
Which card was removed
The sum of all five cards (i.e., 1 + 5 + 7 + 9 + 11) is 33.
For the average of four of these cards to be 6, we want their total to be 24.
That's because 24 / 4 = 6.
To change the total from 33 to 24, we will remove the 9 card.
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