please help me answer this asap

A well-known cosmetics company, Duck Cosmetics has a special machine that has been set up to produce samples of 100 tubes of concealer with an average concealer content of 48 mL. Calculate 80% and 95% confidence interval for the average concealer content, assuming that the population standard deviation (o) is 5 mL. (5 marks) A group of UMT researchers have developed a new method to detect mercury levels in fish by analyzing them using atomic absorption spectrophotometry. To verify the validity of the new method, they obtained standard reference materials and analyze it. A total of ten replicates were analyzed, and the mean of the results found was 17.5 ppm with a standard deviation of 1.2 ppm. The value listed is 18.4 ppm. By using T-test, calculate the t value and explain briefly whether the method that has been developed by UMT researcher gives a statistical value at the 95% confidence level or not. (5 marks) Sekumpulan penyelidik UMT telah membangunkan kaedah baharu untuk mengesan paras merkuri dalam ikan dengan menganalisisnya menggunakan spektrofotometri serapan atom. Untuk mengesahkan kesahihan kaedah baharu, mereka mendapatkan bahan rujukan piawai dan menganalisisnya. Sebanyak sepuluh replika telah dianalisis, dan purata keputusan didapati ialah 17.5 ppm dengan sisihan piawai 1.2 ppm. Nilai yang disenaraikan ialah 18.4 ppm. Dengan menggunakan ujian-T, kira nilai t dan terangkan secara ringkas sama ada kaedah yang telah dibangunkan oleh penyelidik UMT memberikan nilai statistik yang betul pada tahap keyakinan 95% atau tidak. (5 markah)