Ten customers per hour were asked by the cashier at Burger King if they liked their

meal, and the fraction that said "no" are shown in the table, for a twelve-hour period.

For the data shown above, find

a. Determine the mean sample fraction defective

b. Determing sample standard deviation.

c. The 3-sigma UCL and LCL.

d. Does customer satisfaction at Burger King appear to be in statistical control? How could we improve the analysis?

Hour	Fraction defective
1	0,00
2	0,20
3	0,40
4	0,10
5	0,10
6	0,20
7	0,10
8	0,00
9	0,00
10	0,20
11	0,00
12	0,10