contestada

Here are five number cards.
2
5
7
8
9
One of the cards is removed and the mean average
of the remaining four number cards is 6
Which card was removed?
You must show your working.
Note: Please make sure your final answer says card ...

Respuesta :

Answer:

card 7

Step-by-step explanation:

since the mean of the four remaining cards is 6, then the four cards must add up to 24 since 24/4=6. Currently, the five cards adds up to 31, so 7 should be removed to bring the sum of the four remaining cards to 24.

mrkhur
If the mean of the four remaining cards have an average of 6, then the sum of the cards should be 24 (Average of 6 times 4 cards = 24)

This means that if you add up all 5 cards, and subtract 24 from the sum of all 5, you should get the one that was removed

2+5+7+8+9=31

31-24= 7

This means card 7 is the one that was removed

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