Respondents with unsatisfactory responses may be simply discarded when the proportion of unsatisfactory respondents is

Less than 10%

Explanation:

A part of the data cleaning process that identifies data that are out of range or logically inconsistent, or that have extreme values, consistency checks . Respondents with unsatisfactory responses may be simply discarded when the proportion of unsatisfactory respondents is less than 10%. Unsatisfactory responses are commonly handled by returning to the field to get better data, assigning missing values, or discarding unsatisfactory respondents. he questionnaires with unsatisfactory responses may be returned to the field. where the interviewers recontact the respondents. This approach is particularly  attractive for business and industrial marketing surveys. where the sample sizes are small and the respondents are easily identifiable. However. the data obtained the second time may be different from those obtained during the original survey. These differences may be attributed to changes over time or differences in the mode of questionnaire administration (e.g., telephone versus in-person interview).

c

explanation:

y=mx+b is the right slope of velocity carry the 4 over