Answer :
The best choice of classes is (c)
How to determine the classes
From the parameters, the range of the histogram is:
Range = 0.319 to 0.366
Subtract the least from the highest
Range = 0.366 - 0.319
Range = 0.047
Divide by 6 to determine the class width
Width = 0.047/6
Width = 0.009
So, we have the following classes
0.310 -0.319,.........., 0.360 -0.369
Hence, the best choice of classes is (c)
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