Focus groups
a. are usually composed of 10 to 15 people as participants
b. yield results that are largely dependent on the viewpoint of the researcher
c. always do a good job of representing the broader target market
d. have a low cost per participant

c) up is the direction the magnetic force is acting on the charge.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

well clustered together.

points close on a scatter diagram