Please do the all of the questions and make the answers clears.

In a store, out of all the people who came there thirty percent bought a shirt. Six people came in the store together. Find the probability of one of them buying a shirt. Find the probability of more one of them buying a shirt. Find the probability of at least six of them buying a shirt. A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of 4. Everyone who scores in the top 30% of the distribution gets a certificate. What is the lowest score someone can get and still earn a certificate? Draw and label a graph of the normal distribution for this problem (with labels and shading)