thick is 20 cm long a student makes a 5% error in measuring the stick find the two possible values for the students measu rement

21 or 19.

Step-by-step explanation:

5% of 20 is = 1

for him to make a 5% mistake he has to either go over 1 or miss by 1 so, go over one which gives you 21 and miss one which gives you 19.