Baker Street Stereo is a catalogue ordering operation. The company maintains an ordering staff of 30 telephone operators, who take orders from customers. Management wants to determine the proportion of time that operators are idle. A work sampling study was conducted at random over afour-day period, and the following random observations were recorded:

If management wants the proportion of time from the work sampling study to be ±2% accurate with a confidence level of 98%, how many additional sample observations should betaken?

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