Answer:
21.3776
Step-by-step explanation:
The last one is correct because the answer is 0.466666666666
10 is the population mean.
The SRS he takes, the simple random sample, is the 60 horses with colic. The population would be all of the horses seen at the clinic. Therefore the mean of the horses seen at the clinic would be the population mean.
7.750 and 7.7500 are both equivalent to 7.75, correct me if I’m wrong :)