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The distribution below shows the number of wickets taken by bowlers in one-day cricket matches. Find the mean number of wickets by choosing a suitable method. What does the mean signify?
 
Number of wickets \(20-60\) \(60-100\) \(100-150\) \(150-250\) \(250-350\) \(350-450\)
Number of bowlers \(7\) \(5\) \(16\) \(12\) \(2\) \(3\)
 
Mean \(=\)
 
[Note: Round off the answer to two decimal places]