The interquartile range is found by taking the difference between the 1st and 3rd quartiles and dividing that value by 2.

The total assessed value of property in Brockton has risen by $97 million from last year's figure of $1.563 billion. The property tax rate last year for city services was $0.94181 per $100 of assessed value. If the city's budget has increased by $750,000, what tax rate should it set for the current year?