Question 21 (1 point) The distribution of weights of chocolate bars produced by a certain machine are normally distributed with a mean of 162 grams and a standard deviation of 2 grams. What proportion of chocolate bars produced by this machine weigh less than 160 grams? 0.5000 0.6826 0.3409 0.8413 0.1587 Question 22 (1 point) You have recorded the salary, in thousands of dollars, of a random sample of 100 employees at a large investment firm. A 95% confidence interval for the mean salary is computed to be (78, 102). Which of the following statements gives a valid interpretation of this interval? 95% of the employees at the factory have a salary between $78,000 and $102,000. If we take another sample of 100 employees, then the sample mean salary will be between $78,000 and $102,000 with probability 0.95. 95% of the employees in the sample have a salary between $78,000 and $102,000. We are 95% confident that the average salary for all employees at the firm is between $78,000 and $102,000. We are 95% confident the average salary of the employees in the sample is between $78,000 and $102,000