<prompt> In a class, the mean weight of 4 students is 90 kg and standard deviation is 30, then 95 confidence interval would be accordingly:60-8030-15060-12070-110  <response>: Here, Mean 90 ; Standard deviation 3095 confidence interval Mean - 2 S.DHence, 90 2x30 9060 150 90- 2x30 90-60 30 