The SCO Company serves lunch in a local school. In January, a survey was conducted by distributing a simple questionnaire to 1000 students in the school every day for 10-day, asking that they simply check off that the meal was either satisfactory or unsatisfactory. The numbers of unsatisfactory meals in the survey were: 74, 42, 64, 80, 40, 50, 65, 70, 40, and 75 in the 10 days, respectively.

Construct the appropriate quality control chart(s).

In April, another 3-day survey was conducted, and the numbers of unsatisfactory meals were 100, 80, 130, respectively. Is the process of serving lunch overall in control in April?