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The following are the times to failure of 38 light

The following are the times to failure of 38 light bulbs, given in hours of operation.

(a) Dropping the rule that class intervals must be equal, construct a frequency distribution from these data.

(b) Can you find the class mark of every class?

(a) Dropping the rule that class intervals must be equal, construct a frequency distribution from these data.

(b) Can you find the class mark of every class?

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