STATISTICAL METHOD –DESPERSION USING CODING PROCEDURE
the length of 50 copper plugs gave the following frequency distribution
|
length x (mm) |
14.0-14.2 |
14.3-14.5 |
14.6-14.8 |
14.9-15.1 |
15.2-15.4 |
15.5-15.7 |
15.8-16.0 |
|
Frequency f |
2 |
4 |
9 |
15 |
11 |
6 |
3 |
(a) Calculate the mean and the standard deviation
(b) For a full batch of 2400 plus, calculate
i. The limits between which all the lengths are likely to occur
ii. The number of plugs with lengths greater than 15.09mm.
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