Given the following unit time observations (time in hundredths of minutes) for five work elements, if performance ratings for all elements are 1.10 and total allowances are 15%:
Cycle Element
Number 1 2 3 4 5
|
1
|
23
|
13
|
16
|
10
|
12
|
|
2
|
20
|
14
|
21
|
10
|
11
|
|
3
|
21
|
16
|
18
|
9
|
10
|
|
4
|
19
|
15
|
17
|
10
|
13
|
|
5
|
22
|
15
|
18
|
9
|
12
|
|
6
|
19
|
13
|
19
|
12
|
11
|
|
7
|
21
|
16
|
17
|
9
|
13
|
|
8
|
23
|
17
|
18
|
11
|
12
|
|
9
|
20
|
16
|
19
|
10
|
11
|
|
10
|
23
|
17
|
20
|
9
|
13
|
|
Std Dev
|
1.5951
|
1.4757
|
1.4944
|
0.9944
|
1.0328
|
| |
|
|
|
|
|
a. Compute the average time.
b. Compute the normal time.
c. Compute the standard time.
d. Compute the number of cycles to observe given 95% confidence & an error of 1 one-hundredth of a minute. (note that the above data is in hundredths of a minute)