Answer:
Upper bound 3.116
Lower bound 3.125
Step-by-step explanation:
The random circle Hellen drew has a circumference of C=405mm to 3 significant figures and she gets a diameter, d, of 130 mm correct to 2 significant figures.
We need to use the formula
π = c/ d
We substitute the values to get:
π = 405/130
Therefore Hellen's value for π is 3.115 to three decimal place.
To find the lower and upper bound, we half the specified degree of accuracy.
We then add it to the rounded value to get the upper bound to be:
3.115+0.0005=3.1155
The lower bound is 3.115-0.0005=3.1145
