Respuesta :

wegnerkolmp2741o

Answer:

6

Step-by-step explanation:

To find the mean, we take the numbers on the cards and divide by the number of cards.  Let x be the number on the 5th card

( 3+5+7+9+x) / 5 = 6

(24+x)/5 = 6

Multiply both sides by 5

24+x = 30

Subtract 24 from each side

24+x-23 = 30-24

x=6

mathstudent55

Answer:

6

Step-by-step explanation:

Since the mean of the 4 values in the first 4 cards is 6, only by having a value of 6 in the fifth card can he keep the same mean.

Answer: 6