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 If you wanted the margin of error for the 99% confidence interval to be ±1 inch, which size of simple random sample should you select?

A) 2
B) 7
C) 16
D) 39