Laboratory work can be started immediately upon entering the laboratory even if the instructor is not yet present. Never remove chemicals or other equipment from the laboratory. Chipped or cracked glassware is okay to use. Read all procedures thoroughly before entering the laboratory.
Is the answer
Answer: 10
Explanation:
When the number removed, the mean change from 12 to 11, so we assume that the removed number, x, has related to the median.
To find the removed number x, we sat their average equal to 11.
(12 + x) /2 = 11
12 + x = 22
x = 10