An industry made a random selection of 629 employees for participating in a taste test of different brands of tea. They found that 162 employees preferred a certain brand of tea. Based on a 95% confidence interval, estimate the proportion of the employees who prefer that brand. Considering the given measurements as a sample, find the sample variance. 83 63 58 69 59 84 61 77 If the mean and standard deviation of the distribution are given by 27 and 28 respectively, find the z-score for the score 48.