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Engineering statistics

(a) From the following table of durabilities of marine coatings on electrical boxes, find the following quantities:

Durability
(ASTM Salt
Spray Test) Class Frequency
Hours Midpoint
Class Interval xi fi

100-103.9 102 6
104-107.9 106 12
108-111.9 110 18
112-115.9 114 28
116-119.9 118 14
120-123.9 122 6
124-127.9 126 2

(i) the mean

(ii) the standard deviation

(iii) the skewness

(iv) What type of distribution would this represent? Why is it important to determine the type of distribution represented by data such as this?

Please see attached.

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