1. A stress researcher is measuring how fast parents respond to a crying infant. He gathers data from 49 people (N = 49). His participants' reaction times are normally distributed. The average reaction time was 4.0 seconds, with a standard deviation of 0.2 seconds. Using a standard normal table (Table A-1 in the Appendix of the textbook), answer the following questions (hint: you need to convert raw scores into z-scores). a. What proportion of his participants will be between 3.9 and 4.6 seconds? b. What proportion of his participants will be between 3.4 and 4.2? C. What proportion of his participants will be between 4.3 and 4.7? d. What proportion of participants will be above 4.4 seconds