Question 339740
a. Probability the heights of both are between 66 and 70 inches
P((both between 66 and 70)={{{P(66<x<70)P(66<y<70)=0.5*0.5=0.25}}}
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b. probability the first is shorter than 66 inches and the second is taller than 70 inches. 

P(x<66 and y>70)=P(x<66)P(>70)=0.3*0.2=0.06
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c. probabilitythe first is 70 inches or shorter and the second is 66 inches or taller
P(x<70 and y>66)=P(x<70)P(>66)=(0.3+0.5)*(0.5+0.2)=0.8*0.7=0.56