An engineering workshop which fabricates window frames has set a target to complete $200$ frames

every month in $2022.$ The following data from the last $18$ months is available. Plot a Z$-$chart to help

the manager of the workshop track the fabrication progress at the end of June $2022.$

Month Number completed

$(2021)$

Number completed

$(2022)$

January $150190$

February $160185$

March $180200$

April $220235$

May $140130$

June $140160$

July $150$

August $170$

September $190$

October $190$

November $200$

December $120$