Question

http://prntscr.com/6nf8p8

Answer 1

I don't know any short way to do this...so give me a minute and I will work it out

Answer 2

ok

Answer 3

?

Answer 4

(6 + 8 + 12 + 15 + 18 + 20 + 20 + 20 + 26 + 28 + 29 + 30 + 31 + 32 + 32 + 34) / 16 = 361/16 = 22.5625 (this is mean without the 20 added)
median is : (20 + 26) / 2 = 46/2 = 23 (without 20 added)

with 20 added :
(361 + 20) / 17 = 381/17 = 22.411
median = 20

mean is decreased by : 22.5625 - 22.411 = 0.1515
median is decreased by 3

Answer 5

its D

Answer 6

thanks

Answer 7

YW :)