Question

For the data shown in the stem-and-leaf plot, what is the effect on the mean and median of adding the value 10 to the data set?



A.
The mean is decreased by about 0.7 and the median is decreased by 2.

B.
The mean is decreased by about 0.7 and the median is decreased by 3.

C.
The mean is decreased by about 1.2 and the median is decreased by 2.

D.
The mean is decreased by about 1.2 and the median is decreased by 3.

Answer 1

@jtbulin

Answer 2

@ranga

Answer 3

ok. it is 6, 8, 12,15,18, 20,20,20,26,28,29,30,31,32,32,34. the mean is all the numbers, divided by how many there are. So I will show you that first.

Answer 4

\[ 6+8+ 12+15+18+ 20+20+20+26+28+29+30+31+32+32+34=361]/

Answer 5

\[361/16=22.5\]

Answer 6

huh?

Answer 7

if you add 10 to that long list of numbers we added, it would be 371... just stick with me.. it'll make sense in a minute

Answer 8

371/17=21.8

Answer 9

so the difference between the mean is .7 now lets do the median

Answer 10

the median of this is 23.