here this is binomial distribution with paramter p=0.70
1) probability that Valentino's will gross more than $1500 a day for 7 or more days
=P(X>=7)=P(X=7)+P(X=8)
= =0.1977+0.0576=0.255
2)
probability that Valentino's will gross more than $1500 a day for 5 or more days
=P(X=5)+P(X=6)+P(X=7)+P(X=8)=0.2541+0.2965+0.1977+0.0576 =0.806
3)
probability that Valentino's will gross more than $1500 a day for less than four days
=P(X=0)+P(X=1)+P(X=2)+P(X=3)=0.0001+0.0012+0.0100+0.0467 =0.058
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