Three cars are driving on a racetrack. The mean speed of the three cars is 100 miles per hour. Car X drives 103 miles per hour and Car Y drives 118 miles per hour. Use the mean to estimate the speed of Car Z. What is the speed of car Z?
+130516 Since one car travels at 118 and one at 103....and the average speed is 100....we might estimate the third car's speed to be 100 - 18 = about 82 mph
To find the exact speed:
We have
[103 + 118 + Z] / 3 = 100 multiply both sides by 3
103 + 118 + Z = 300 simpify
221 + Z = 300 subtract 221 from each side
Z = 79 mph
+130516 Since one car travels at 118 and one at 103....and the average speed is 100....we might estimate the third car's speed to be 100 - 18 = about 82 mph
To find the exact speed:
We have
[103 + 118 + Z] / 3 = 100 multiply both sides by 3
103 + 118 + Z = 300 simpify
221 + Z = 300 subtract 221 from each side
Z = 79 mph
