Question

Three cars are driving on a racetrack. The mean speed of the three cars is 100 miles per hour. Car X drives 109 miles per hour and Car Y drives 111 miles per hour. Use the mean to estimate the speed of Car Z. Then find the actual speed of Car Z.
Estimate the speed of Car Z. Choose the correct answer below.
A.
The speed of Car Z is about 100 miles per hour.
B.
The speed of Car Z is less than 100 miles per hour.
C.
The speed of Car Z is greater than 100 miles per hour.
D.
It is impossible to estimate the speed of Car Z.

Answer 1

Answer:

B

Step-by-step 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 109, 111, and Z or unknown. The mean of them is 100. Solve for Z.

100 =(109+111+Z)/3

300=220+Z

80=Z

The speed of Car Z is less than 100.