The table shows the time taken by Flynn to run 100 metres during his training sessions. After 3 attempts, Flynn wanted to improve his average time taken by 0.3 seconds by running faster in the 4
th attempt. How fast should he run in the 4
th attempt in order for him to make the improvement?
Attempt |
1st |
2nd |
3rd |
4th |
Time taken (in seconds) |
24 |
18 |
24 |
? |
Total time that Flynn took for the first 3 attempts
= 24 + 18 + 24
= 66 s
Average time that Flynn took for the first 3 attempts
= 66 ÷ 3
= 22 s
New average time that Flynn took for the 4 attempts
= 22 - 0.3
= 21.7 s
Total time that Flynn took for the 4 attempts
= 4 x 21.7
= 86.8 s
Time that Flynn should run in the 4
th attempt in order for him to make the improvement
= 86.8 - 66
= 20.8 s
Answer(s): 20.8 s