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. Question 4 0/1 pt 9 3 0 The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 54 and a standard deviation of 11. Using the Empirical Rule rule, what is the approximate percentage of lightbulb replacement requests numbering between 32 and 54? Do not enter the percent symbol. ans = 9% Question Help: Video Submit QuestionScore . Question 5 60/1 pt 1 3 0 The results of a common standardized test used in psychology research is designed so that the population mean is 170 and the standard deviation is 50. A subject earns a score of 220. What is the z-score for this raw score? z-score = Question Help: Video Submit Question. Question 6 0/1 pt 9 3 0 The results of a common standardized test used in psychology research is designed so that the population mean is 115 and the standard deviation is 20. A subject earns a score of 75. What is the z-score for this raw score? z-score = Question Help: Video Submit QuestionQuestion 7 0/1 pt On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of 115 and a standard deviation of 16. Suppose one individual is randomly chosen. Let X = IQ of an individual. Round all your answers to 2 decimal places if necessary. a. What is the distribution of X? X ~ N( b. Find the probability that a randomly selected person's IQ is over 84. c. A school offers special services for all children in the bottom 3% for IQ scores. What is the highest IQ score a child can have and still receive special services? d. Find the Inter Quartile Range (IQR) for IQ scores. Q1: Q3: IQR: Helpful videos: P(x a number) , P(x is between two numbers) , Finding a percentile , Using the invNormal with greater than problems , Finding the IQR Hint 57