PLEASE HELP ANSWER THIS ASAP! The table shows the estimated costs at a college for one year. Dolly's family devised a periodic savings plan that will have $43,000 by the time Dolly begins college. Dolly also qualified for a scholarship for the first year tuition and fees. With the scholarship and her family contribution , what percent of the total of the three years is accounted for? Round to the nearest tenth of a percent.

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.