In an industry, a study is carried out on the number of errors a printer makes. According to the number of errors (X), the probability is the following: p(x=1)=0.05, p(x=2)=0.2, p(x=3)=0.25, p (x=4)=0.2 and p(x=5)=0.3. Calculate the probability of p(x≥4).
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