Answer: X=12.7
Step-by-step explanation:
Sorry if its wrong I am pretty rusty with these kind of questions
A rhombus is a parallelogram with four equal sides and two sets of equal angles.
If the m<1=160°, then the angle opposite (3) would also be 160°.
m<3=160°.
Becuase it is a parallelogram, the sum of the measurment of two angles that share a line would be 180 (supplementary).
m<2 and m<4 is 20°.
Standard error (SE)

Or

Therefore, SE of the mean = (8)/(2) =4
The correct answer is b) 2