Estimating the error
Answers are for parents and teachers.
1
Write x = 12 ± 0.5 as a double inequality.
11.5 ≤ x ≤ 12.5
2
Write 3.9 ≤ x ≤ 4.1 in the form x = a ± h.
x = 4 ± 0.1
3
A temperature lies between the 18 °C and 19 °C marks. Write an approximate value and an error bound.
18.5 ± 0.5 °C
4
If x = 100 ± 5, what is the smallest value of x?
95
5
Write “the absolute error does not exceed 0.2” as a formula (x exact, a approximate).
|x - a| ≤ 0.2