We wish to construct a 99% confidence interval for the true mean oven temperature of a
certain oven model. Four ovens of this model are selected at random. The dial on each is set
to 300°F, and, after one hour, the actual temperature of each is measured. The temperatures
measured are 305°, 310°, 300°, and 305°. Which of the following options gives the correct
notation for and value of the point estimate?