Three quarter of the students running a 100-yard race finished with an average time of 16 seconds. the remaining 25% of students finished with an average time of 12 seconds. what was the average time overall?

15 seconds

Step-by-step explanation:

Because the split id 25% and 75%, we could create another average pretending that there are four kids, one who ran in 12 seconds, and three who ran in 16.

Equation for averages: (a₁ + a₂ + a₃ + ... )/ n

Plug in: (12 + 16 + 16 + 16)/4

Add: 60/4

Divide: 15 seconds

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.