The average of 10 numbers is −10. If the sum of 6 of them is 100, what is the average of the other 4? 20pts
Mathematics · Middle School · Thu Feb 04 2021
Answered on
Given : average of 10 numbers = -10
Sum of 6 numbers =100
Let the sum of remaining 4 number be x
Formula Used : Average = Sum of all observations/number of observations
-10 = (100 + x)/10
Cross-Multiplying, we get
-100 = 100 + x
x = -100 - 100
x = -200
Average of 4 numbers = -200/4
= -50
Thus, the average of 4 numbers are -50.