Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the mean Evaluation number (Before April 2009) when the percentage of negative evaluations was 0.8% and the mean Evaluation number of April 2009 was 4.2?

### Inputs:
table_name: table, columns: ['Evaluation average (From February 2011)', 'Evaluation average (From April 2009)', 'Evaluation average (Before April 2009)', '% of negative evaluations', 'Submitting schedule on time', 'Punctuality/Attendance issues', 'Peak lessons taught']

### Response:
SELECT Evaluation average (Before April 2009) FROM table WHERE % of negative evaluations = 0.8% AND Evaluation average (From April 2009) = 4.2