SOLUTION: The number of defective pieces in a sample of 20 bulbs are Number of defective pieces 0 1 2 3 4 5 Frequency 8 10 12 3

Question 887733: The number of defective pieces in a sample of 20 bulbs are
Number of
defective
pieces 0 1 2 3 4 5
Frequency 8 10 12 3 5 2

The average number of defective piece per sample is ?
Found 2 solutions by stanbon, skartikey:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The number of defective pieces in a sample of 20 bulbs are
Number of
defective
pieces 0 1 2 3 4 5
Frequency 8 10 12 3 5 2
The average number of defective piece per sample is ?
----------------
[0*8+1*10+2*12 + 3*3 + 4*5 + 5*2]/[8+10+12+3+5+2] = 73/40 = 1.825
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Cheers,
Stan H.
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Answer by skartikey(21) (Show Source): You can put this solution on YOUR website!
x f f*x
0 8 0
1 10 10
2 12 24
3 3 9
4 5 20
5 2 10
---------------
sum 40 73
mean=sum(f*x)/sum(f)=73/40=1.825
therefore, the average number of defective piece per sample is 1.825.
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