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The number of telephone calls received a...

The number of telephone calls received at an exchange per interval for 250 successive one-minute intervals are given in the following frequency table: No. of calls `(x)` : 9 1 2 3 4 5 6 No. of intervals `(f)` : 15 24 29 46 54 43 39 Compute the mean number of calls per interval.

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