a) i) probability when specif value of data given, z-score formula with sample mean, area under the probability curve

a) ii) 95 % confidence interval with population proportion formula

b) i) analyses of population proportion formula for 95% confidence interval

b) ii) derivate of quadratic equation, maximum value

b) iii) margin of error=radius, application of formula for 95% confidence interval with population proportion

c) compound interest formula in application with geometric sequence sum