Answer:
214.389 to 245.611 calories
Explanation:
A confidence interval can be constructed as follows:
Lower bound (L):

Upper bound (U):

Where 'X' is the sample mean, 's' is the sample standard deviation, 'n' is the sample size, and Z is the x-score associated with the confidence interval.
In this problem
X = 230; S= 15; n=10; and for a 99% confidence interval, z = 3.291
The upper and lower bounds are:

The confidence interval is 214.389 to 245.611 calories.