What is the mean absolute deviation of the data: 15.6, 19.8, 12.2, 21.7, 25.3, 16.5 and 19.8? round to the nearest tenth.

mean absolute deviation = ∑|(xₐ - mean )| ÷ n

where xₐ  is every term in the data set

n is total number of terms

mean for the given data set = sum of all terms ÷ total number of terms =

130.9 ÷ 7 = 18.7

mean absolute deviation = ∑|(xₐ - mean )| ÷ n

mean absolute deviation == 23.6 ÷ 7 = 3.37

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

source:

use google you idiot omg you're so annoying

step-by-step explanation: