For four the answer is a for five the answer is b
there are 8 numbers and you want to get either a 3 or an 8
3 or 8 is 2 numbers out of the 8
so you have a 2/8 reduced to a 1/4 probability of getting them.
Answer: a: 55 microns- 75 microns
b: 3.4 feet- 3.6 feet
Step-by-step explanation:
For letter a you have an accuracy up to 10 microns so add and subtract from the original number; the same applies to letter b just turn the percentage to a decimal then add and subtract. Hope that helps!