The Time (In Number of Days) Until Maturity of a Certain

Multiple Choice

The time (in number of days) until maturity of a certain variety of tomato plant is Normally distributed, with mean and standard deviation ?= 2.4. You select a simple random sample of four plants of this variety and measure the time until maturity. The four times, in days, are as follows:
63 $\quad$ 69 $\quad$ 62 $\quad$ 66 Based on these data, what is the 99% confidence interval for ?, in days?

A) 65.00 ± 1.55
B) 65.00 ± 2.35
C) 65.00 ± 3.09
D) 65.00 ± 4.07