After teaching a group of nursing students about using zeros, the instructor determines that the teaching was successful when they identify which as the correct placement of a zero in a decimal

0.85 or 0.65

Explanation:

Choosing an answer such as .850 or .650 reveals that the group of nursing students have not yet successfully understood the teaching on how to use zeros in a decimal. This is an incorrect placement of zero in a decimal. An ommission of the decimal can cause .850 to be read as 850 or .650 to be read as 650

However, if the group of nursing students understood the teaching successfully, they will choose an answer such as  0.85 or 0.65. This accurately depicts their understanding of the usage of zeros in a decimal

When there is no integer on the left side of the decimal, it implies that a zero should be written there. For example, a correct placement of zero in a decimal is shown in the number 0.85 or 0.65. Knowing fully well that the decimal is very small and as such may not be seen if the "0" before the decimal is ommitted, this can lead to a massive overdosage of the prescribed medication. We thus see that all decimal points should be clearly written and seen