The correct option is A.
One of the basic feature of an experiment is the selection of participants by means of random method. It is very important to select participants randomly in order to avoid experimental bias that may occur as a result of the participants not been an exact representation of the concerned population.
Answer:18%
Step-by-step explanation:
Check the picture below.
so we have a rectangle with two circles, the rectangle is a 21x10.5 and the circle's have a radius of 5.25, so let's <u>get the area of the two circles and subtract it from the whole area of the containing rectangle</u>.
Answer: $152
20% = 0.20, 190 x0.20 = 38
190 - 38 = $152