The probability that his model rocket has landed in a grassy area will be equal to 0.4.
What is probability?
The extent to which an event is likely to occur, is measured by the ratio of the favorable cases to the whole number of cases possible.
The total area of the land will be = 5+15+30=50 acres
Now the total grassy area will be =15+5=20 Acres
Now the probability of the model rocket to land on the grassy land will be:
[tex]P=\dfrac{Grassy\ area}{Total\ area}[/tex]
[tex]P=\dfrac{20}{50}=0.4[/tex]
Hence the probability that his model rocket has landed in a grassy area will be equal to 0.4.
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