have to provide 4 decimal place answer

The lifetime (hours) of 20 lightbulbs were recorded and the sample data are shown in the following stem-aodleaf plot. Stem (in 10) Leaf (in 1} 3 2 4 5 4 6 A 9 5 5 5 7 8 6 B 5 6 8 8 8 7 2 5 6 C (a) Suppose that the interquartile range of the sample data is 20, the range of the sample data is 45, and the median of the sample data is 61. Find A, B, and C. (b) Construct a box-and-whisker diagram for the sample data