For the purposes of viewing the data, it is easier to visualise the reverse of that measure, namely the percentage of payments received by cheque, with a target range of 5-10%.
At ddibenion astudio’r data, mae'n haws dychmygu’r mesur hwnnw wedi’i wrthdroi, sef ystod darged o 5-10% ar gyfer canran y taliadau a dderbynnir drwy siec.