Below you are given ages that were obtained by taking a rand

Below you are given ages that were obtained by taking a random sample of 9 undergraduate students. Assume the population has a normal distribution. Construct a 99% confidence interval for the average age of undergraduate students.

40, 42, 43,39, 37,39

There are given only 6 values, this is why i am confused. Is there a mistake in a text or this is a normal problem?

Solution

No, this is not a normal problem. There is a mistake in this question . All 9 values should be given .