The number of steps to cover the same distance was measured for 61 randomly chosen people. the sample mean is x = 2640 steps and the sample standard deviation is s 528 steps. assume distribution to be normal round your answers to the nearest integer (e. g. 9876) a) construct a 90% two-sided confidence interval on the mean ≤ μ ≤ b) construct a 90% lower confidence bound on the mean μ ≥ c) construct a 90% upper confidence bound on the mean μ ≤