The rate at which customers are served at an airport check-in counter is a poisson process with a with a rate of 9.5 per hour. suppose that a random sample of 50 customers is observed. the probability that the average waiting for these 50 customers is less than 8 minutes is given by, p(latex: \overline{x}x ¯ < 8) = p(z < a), where z is the standard normal variable. what is the value of a? report your answer in 3 decimal places.

Ascientist studied a population of workers to determine whether verbal praise and/or tangible rewards affect employee productivity. in the study, some workers were offered verbal praise, some were offered tangible rewards (gift cards, presents, and some were offered neither. the productivity of each participant was measured throughout the study by recording the number of daily tasks completed by each employee. which inference might the scientists make based on the given information? a.) the number of daily tasks completed by each employee may influence the dependent variable, which is whether the employee receives verbal praise, tangible rewards, or neither. b.) verbal praise and/or tangible rewards may influence the independent variable, which is the number of daily tasks completed by each employee. c.) verbal praise and/or tangible rewards may influence the dependent variable, which is the number of daily tasks completed by each employee. d.) the dependent variables, which are verbal praise and tangible rewards, may influence the number of daily tasks completed by each employee.