Question

Three cars are driving on a racetrack. The mean speed of the three cars is 100 miles per hour. Car X drives 101 miles per hour and Car Y drives 116 miles per hour. Use the mean to estimate the speed of Car Z. Then find the actual speed of Car Z.

Answer 1

Less than 100. Z=83

Explanation:

The mean is the average found by adding the sum of the data points and dividing by the number of them. Here there are 3 cars whose speeds are 101, 116, and Z or unknown. The mean of them is 100. Solve for Z.

100 =(101+116+Z)/3

300=217+Z

83=Z