Summary Description. Assemble, install, or maintain solar photovoltaic (PV) systems on roofs or other structures in compliance with site assessment and schematics. May include measuring, cutting, assembling, and bolting structural framing and solar modules. May perform minor electrical work such as current checks.
IFERROR(value, value_if_error) The IFERROR function syntax has the following arguments: Value Required. The argument that is checked for an error. Value_if_error Required. The value to return if the formula evaluates to an error.
1 In this case you use Formula Two. 2  You are told the margin of error which is acceptable, and asked to compute the sample size. 3  In this case you use Formula Three. 4  If not told otherwise, assume that any question which asks for a sample size wants a margin of error for percentages.