were observ 6.5, 9.3, 4.4, 4.0, 3.8, 4.0. Find the interquartile range. 15. For the following annual rainfall data, find the grouped mean and the grouped variance. Rainfall < 20" 20-29.9" 30-39.9" 40-49.9" 50-59.9" ≥60" Number of years observed SONFM N 5 10 12 11 3 2 16U8 on J mun 000 Notice that assumptions must be made about the 'midpoints' of the open-ended age groups. In this example, use 15" and 65" as the midpoints of the first and last rainfall groups, respectively.

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