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Chemical engineering progress

According to Chemical Engineering Progress (Nov. 1990) approximately 30% of all pipework failures in chemical plants are caused by operator error.

(a) What is the probability that out of the next 20 pipework failures at least 10 are due to operator error?

(b) What is the probability that no more than 4 out of 20 such failures are due to operator error?

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Use the four steps of testing hypothesis at 0.05 level of significance to test the null hypothesis Musub1-Musub2=-0.5 against the altenative hypothesis Musub1-Musub2<-0.5.