Calculate visits per employee and the cost per visit for each week. Calculate the mean and standard deviation for these measures for this six-month period. Explain how these statistics are useful in understanding the trend in total outpatient physician costs per Sparks Interactive employee.

Week	Total Costs of Physician Visits	# Visits	# Employees
1	$80,226	416	4070
2	$80,804	438	4070
3	$77,446	419	4067
4	$75,671	422	4068
5	$77,597	419	4074
6	$77,433	447	4075
7	$77,423	445	4081
8	$79,952	467	4081
9	$78,789	472	4088
10	$79,737	474	4086
11	$82,691	461	4093
12	$83,212	496	4092
13	$83,541	499	4100
14	$83,271	499	4106
15	$82,528	506	4104
16	$88,641	511	4108
17	$83,601	515	4117
18	$86,125	465	4120
19	$83,418	484	4131
20	$86,254	513	4135
21	$94,600	510	4134
22	$97,484	515	4134
23	$102,667	535	4134
24	$101,294	520	4141
25	$102,876	532	4142