A number, m, is rounded to 1 decimal place - Edexcel - GCSE Maths - Question 4 - 2020 - Paper 3

When rounding to 1 decimal place, if the rounded result is 9.4, it implies that:

• The smallest possible value for m, just before rounding up to 9.4, is 9.35.
• The largest possible value for m, just before rounding down to 9.4, is 9.44.

Thus, the error interval for m can be expressed as:

$9.35 \\leq m < 9.45$

Alternatively, this can be expressed as:

$m \in [9.35, 9.45)$.