|
Rate (N)
|
Frequency
|
|
32.5
|
3 |
|
33.0
|
7 |
|
33.5
|
15 |
|
34.0
|
13 |
|
34.5
|
20 |
|
35.0
|
18 |
|
35.5
|
17 |
|
36.0
|
3 |
|
36.5
|
3 |
|
37.0
|
1 |
(a) Does it seem that the "rates" are Normally distributed? (Provide clear evidence for your conclusion).
(b) If the distribution were Normal. what proportion of all springs would be expected to lie outside the specification?
(c) From the sample, does it seem that the population mean is on target?