A contract for the maintenance of a leading manufacturer's computers was given to a team of specialists. After six months, the supervisor of the team felt that computer performance could be improved by modifying the existing IC board. To document the current status, the team collected data on the number of IC board failures. Use the data below to:

(a) calculate the sample mean $\bar{x}$,

(b) calculate the sample standard deviation $s$.

Number of IC board failures:

12	3	8	6	19	1	2	5
1	11	14	3	13	2	9	8
2	1	4	13	3	11	9	15
14	5	12	7	6	16	10	0