The table shows the time taken by Caden to run 100 metres during his training sessions. After 3 attempts, Caden wanted to improve his average time taken by 1.2 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) |
16 |
20 |
15 |
? |
Total time that Caden took for the first 3 attempts
= 16 + 20 + 15
= 51 s
Average time that Caden took for the first 3 attempts
= 51 ÷ 3
= 17 s
New average time that Caden took for the 4 attempts
= 17 - 1.2
= 15.8 s
Total time that Caden took for the 4 attempts
= 4 x 15.8
= 63.2 s
Time that Caden should run in the 4
th attempt in order for him to make the improvement
= 63.2 - 51
= 12.2 s
Answer(s): 12.2 s