The mean speed of vehicles along a stretch of highway is 75 miles per hour with a standard deviation of 3.8 miles per hour. your current speed along this stretch of highway is 62 miles per hour. what is the z-score for your speed? z- score = (round to two decimal places) flag this questionquestion 23 ptsfor a statistics test the mean is 63 and the standard deviation is 7.0, and for a biology test the mean is 23 and the standard deviation is 3.9. a student gets a 60 on the statistics test and a 22 on the biology test, on which of the two tests the student perform better? group of answer are equal flag this questionquestion 321 ptsintelligence quotients (iq scores) are normally distributed with a mean of 100 and a standard deviation of 15. an individual is selected at random, determine the probability that the individual has iq scores. round all answers to 4 decimal places. a) below 90. b) above 130. c) between 90 and 130.