SOLUTION: twenty sheets of aluminium alloy are examined for surface flaws the frequency of the number of sheets with the given number of flaws per sheet was as follows no of follows 0

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Question 1192111: twenty sheets of aluminium alloy are examined for surface flaws the frequency of the number of sheets with the given number of flaws per sheet was as follows
no of follows 0 1 2 3 4 5 6
frequency 4 3 5 2 4 1 1
what is the probability of finding a sheet choosen at random which contains 3 or more surface flaws?
Answer by greenestamps(13203) About Me  (Show Source):
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Use the basic definition of probability:
                      number of sheets with 3, 4, 5, or 6 flaws     2+4+1+1
P(3 or more flaws) = ------------------------------------------- = ---------
                              total number of sheets                  20