Sara is researching phones and decides to create a weighted average to determine the ‘best’. She uses the following weights: 50% battery life, 30% cost, 20% camera to calculate a ‘score’ for each phone. She finds the following ratings out of 10 for each category on the internet.

Question

Sara is researching phones and decides to create a weighted average to determine the ‘best’. She uses the following weights: 50% battery life, 30% cost, 20% camera to calculate a ‘score’ for each phone.  She finds the following ratings out of 10 for each category on the internet.

Battery Cost Camera
iPhone	 9	 7	 8
Samsung	 9	 7	 7
Motorola 	 8	 9	 8

Calculate the weighted average ‘score’ for each phone.

(round to the tenths place)

PsyDAG · Accepted Answer

I will give you a start. iPhone = .5(9) + .3(7) + .2(8) = ?

Anonymous · Answer

8.2