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The weights of tea in 70 packets are shown in the following table:

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The weights of tea in 70 packets are shown in the following table:

Find the mean weight of packets using step deviation method.

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Let us choose a = 202.5, h = 1, then di = xi – 202.5 and ui = (xi−202.5)/ 1 

Using step-deviation method, the given data is shown as follows:

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