There is a difference in the mean calculation in the chart vs the average shown by SurveyMonkey. Why is that?

SurveyMonkey provides mean calculation for a Rating question. You may find this calculation is different when using the same question in iCharts. In SurveyMonkey, you can specify a “N/A” as an option in the scale. SurveyMonkey makes the weight of this option as 0. When the same is charted in iCharts, it will include the N/A responses in the calculation. In order to exclude the N/A responses, simply select the filter that has the scale, and uncheck N/A. Now, the calculation will match with SurveyMonkey.