Respuesta :
Answer:
The time for the fourth run is 53.5 seconds
Step-by-step explanation:
To calculate the average of the 4 runs, what we do is to add the time taken in the runs together and divide by 4.
Since we do not know the time for the 4th run, we can call it x.
Thus, mathematically;
(52.7+53.3+54.1+x)/4 = 53.4
(160.1+x) = 4(53.4)
160.1 + x = 213.6
x = 213.6 - 160.1
x = 53.5 seconds
Answer: the time for the fourth run is 53.5 seconds.
Step-by-step explanation:
Let t represent the time for the fourth run.
Average time = total time for the runs/the number of runs
From the information given,
Average time = 53.4 seconds
Number of runs = 4
Sum of the four runs = 52.7 + 53.3 + 54.1 + t = 160.1 + t
Therefore,
53.4 = (160.1 + t)/4
Cross multiplying by 4, it becomes
53.4 × 4 = 160.1 + t
213.6 = 160.1 + t
t = 213.6 - 160.1
t = 53.5 seconds
