B1. List A has 20 entries, with an average value of 510, and with a standard deviation of 76.

List B has 15 entries, with an average value of 580, and with a standard deviation of 88.

These lists are combined to produce a single list of 35 entries.

Consider the following statements:

I The mean of the combined list will be between 510 and 580. II The standard deviation of the combined list will be larger than 76. III The mean of the combined list can be found through the arithmetic 20 510 15 580

+

35

Which of the following statements are correct?

A. None

B. Only II

C. Only I and III

D. I, II, and III