Statistics help. how to find average number
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Statistics help. how to find average number

[From: ] [author: ] [Date: 11-09-14] [Hit: ]
.....The correct answer is suppose to be 3.......
you have received a few used parts from a dealer. many have components missing. what is the average number of components missing? given the following table...

components missing: Number of parts
0: 35
1-3: 50
4-6: 60
7-9: 40


...The correct answer is suppose to be 3.89, but what do I do to get this number?

-
For the 1 to 3 group assume an average of 2. For the other two groups assume averages of 5 and 8.

Mean number of parts missing = (35*0 + 50*2 + 60*5 + 40*8) / 185
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