Fire load (MJ/m2) is the heat energy that could be released per square meter of floor area by combustion of contents and the structure itself. The following cumulative percentages are for fire loads in a sample of 388 rooms:
Fire load (MJ/m2) is the heat energy that could be
Value 0 150 300 450 600 750 900
Cumulative % 0 19.0 37.0 61.9 76.5 86.3 93.0
Value 1050 1200 1350 1500 1650 1800 1950
Cumulative % 95.0 97.8 98.1 99.5 99.6 99.8 100.0
(a) What proportion of fire loads are less than 600? At least 1200? (Round your answers to three decimal places.)
(b) What proportion of the loads are between 600 and 1200? (Round your answer to three decimal places.)
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