I'm having trouble solving #3 (a.), (b.), (c.). Please show steps, answers, and bell-curve for confidence interval.

3. The Tong, dah Tong, Tong, Tong! Gas Grill Corp. hired Hilda & Deni to estimate the proportion of people that had blamed their poor barbequing results on their wood grills. They took a random sample of 90 such people and found that 72 of them had experienced poor results from their wood grills. Help them find a. (1pt.) the point estimate for the population proportion (p). b. (2pts.)the maximum error for the proportion of people that had experienced poor results from their wood grills, when alpha is 2%. c. (3pts.)the 98% confidence interval estimate for p