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The following table shows data about the time taken, in seconds to the nearest second, for completing each one of a series of 75 similar chemical experiments. The meantime of the given data(2D) is
Time
|
Number of experiments
|
50-60
|
4
|
61-65
|
13
|
66-70
|
26
|
71-75
|
22
|
76-86
|
10
|
Total
|
75
|
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