8 State the z scores that most closely approximates the following probabilities hint similar to question 7 but you have to first convert the percentage into a decimal Similar to question 7 but you do not have to solve the entire problem a A top 10 of scores b Bottom 20 of scores c Top 50 of scores 9 A physiological psychologist studied the time it took a new recreational drug to begin to influence interpersonal perception among 145 senior adults The mean time for this population was 140 seconds with a standard deviation of 25 seconds What proportion of the participants in this study took between 135 and 155 seconds before the drug started to influence their interpersonal perception 25 135 14