Answer:
3
Step-by-step explanation:
If 6 numbers have a mean value of 10, it means that the sum of the numbers divided 6 is equal to 10. This can be expressed as:
x÷6=10
x=60
The new number added will be the 7th number and now the mean is 9. You have to ask what number divided by 7 is equal to 9? This can be expressed as:
y÷7=9
y=63
63-60=3
So the new number added is 3
Answer:
Step-by-step explanation:
Well if you want the answers there are 3 different ways
x = 12/5
or
x = 2.4
Answer:
-3 + 11 = 8
Step-by-step explanation:
Answer:
13,7
Step-by-step explanation: