$6\mathrm{.}2$ Pre$-$ and postexamination processing of patients in an outpatient clinic involves various tasks performed by clerks and nurses. A time study conducted by the decision support department is shown in Table EX $6\mathrm{.}2.$

a$.$ Determine the observed time for the pre$-$post exam process.

b$.$ Determine the normal time for the pre$-$post exam process.

c$.$ Determine the standard time for the pre$-$post exam process, using the basic$-$moderate allowance for the job.