What is the standard deviation of the data set? round your answer to the nearest tenth.
6 4 9 5 5 4 5
a. 1.7
b. 1.6
c. 5.0
d. 5.4

the answer, my friend, is d) 5.4

y=250x+2000

Step-by-step explanation:

The farmer starts with 2000 trees and adds 250 each year.

Year 0   2000

Year 1   2000 + 250 = 2000+ 1(250)

Year 2   2000 + 250 +250 = 2000 + 2(250)

Year 3   2000 + 250 + 250 + 250 = 2000 + 3(250)

Year 4   2000 + 250 + 250 + 250 + 250 = 2000 + 4 (250)

Year X   2000 + 250x