Question

A track star ran the​ 100-meter event in six track meets. Her average time for all six meets was 11.8 seconds. She could not find the record for her running time in the last​ meet, but she had all the other​ ones: 11.1 ​seconds, 11.2 ​seconds, 12 ​seconds, 12.1 ​seconds, 11.7 seconds. What was her running time for her last​ meet?

a) 11.3 seconds

b) 11.4 seconds

c) 11.5 seconds

d) 11.6 seconds

Answer 1

The running time for the last meet is 12.8 seconds.

Step-by-step explanation:

To find the running time of the last meet, we can find the sum of the times of all six meets and then subtract the sum of the times of the other five meets from it. The sum of the times of all six meets is 11.1 + 11.2 + 12 + 12.1 + 11.7 + 11.8 = 70.9 seconds. The sum of the times of the other five meets is 11.1 + 11.2 + 12 + 12.1 + 11.7 = 58.1 seconds. Therefore, the running time for the last meet is 70.9 - 58.1 = 12.8 seconds.