Enteroliths are calcifications that form in the gut of a horse. The stones can cause considerable morbidity and mortality. A study was conducted to investigate factors such as diet and environment that may be related to the formation of enteroliths. The study contained seven stallions with their ages, in years, as follows:

10 20 4 13 21 16 16

The mean age for this group of stallions is:

A Enteroliths are calcifications that form in the gut of a horse. The stones can cause considerable morbidity and mortality. A study was conducted to investigate factors such as diet and environment that may be related to the formation of enteroliths. The study contained seven stallions with their ages, in years, as follows:

10 20 4 13 21 16 16

The median age of the stallions is:

B. Enteroliths are calcifications that form in the gut of a horse. The stones can cause considerable morbidity and mortality. A study was conducted to investigate factors such as diet and environment that may be related to the formation of enteroliths. The study contained seven stallions with their ages, in years, as follows:

10 20 4 13 21 16 16

The IQR of age for the stallions is:

C. Enteroliths are calcifications that form in the gut of a horse. The stones can cause considerable morbidity and mortality. A study was conducted to investigate factors such as diet and environment that may be related to the formation of enteroliths. The study contained seven stallions with their ages, in years, as follows:

10 20 4 13 21 16 16

The youngest stallion at 4 years old is:

1) an outlier because it is more than 15 years below the lower quartile.

2) an outlier because it is the minimum.

3) not an outlier because it is less than 15 years below the lower quartile.

4) not an outlier because it is a positive value.