Question

The number of days it takes to fix defects in an eyeglass and the probability that it will take that number of days are listed below:

x	p(x)
1	24.9
2	10.8
3	9.1
4	12.3
5	13.3
6	11.4
7	7.0
8	4.6
9	1.9
10	1.3
11	1.0
12	0.8
13	0.6
14	0.4
15	0.2
16	0.2
17	0.1
18	0.1

c. Find the mean number of days to fix defects

d. Find the variance for the number of days to fix defects.

e. Find the standard deviation for the number of days to fix defects.

f. Find the probability that a lens will take at least 16 days to make a fix the defect.

g. Is it unusual for a lens to take 16 days to fix the a defect?

Answer 1