Post on 04-Jan-2016
6.5 Applying Averages
Obj: To calculate average and Obj: To calculate average and solve problems with averagesolve problems with average
Find Average = Sum
# of items
Example 1
Find the average:Find the average:
95, 95, 95, 7595, 95, 95, 75
95 95 95 4/360 = 90%95 4/360 = 90% 9595 + 75+ 75 360360
Midpoints
A ____________ BA ____________ B
½ way or midpoint Midpoint= A+B
2
Because you have
2 points.
Example 2
Find the midpoint
< >< >14-6
Midpoint = 8 = 4
2
Example 3
Cody wants a 90 for the marking period. If his grades Cody wants a 90 for the marking period. If his grades are 75, 85 and 100- what must he get on the 4are 75, 85 and 100- what must he get on the 4thth test? test?
Let X = 4Let X = 4thth Test Test
Average= Average= Sum Sum
Number 4 [ 90= Number 4 [ 90= 75+85+100+X75+85+100+X] 4] 4
44
360360==260X260X
200 260 200 260 90 = 260+X
90x4 4X=100