8) If IQ scores are normally distributed with a mean of 100 and a standard deviation of 15, and nine people are randomly selected, what is the probability that the average of their IQ scores is between 85 and 120? 0.5899 0.6568 0.6826 0.7011 0.7495 0.7495 0.7938 0.8164 0.8607 None of these 9 A survey estimates that approximately 60% of adults in the US have been tested for COVID-19 since March of 2019. If a sample of 20 adults were chosen at random, what is the probability that more than seven, but less than twelve have been tested? 0.1215 0.3979 0.4447 0.5902 0.6521 0.6900 0 .7336 0.7906 0.7990 None of these 10) Given a normal distribution with a standard deviation of 13, what is the mean if 15% of the values are above 40? 26.48 29.6 31.48 32.72 34.6 41.48 42.72 49.6 52.72 None of these 11 The weight loss for the first month of a diet program is normally distributed with an average 18 pounds and a standard deviation of 5 pounds. Suppose the sponsors gave an award for participants in the 90th percentile of weight loss. How much weight would they have to loss to get the award? (Round to one decimal place.) 15.4 17.1 18.7 20.0 20.1 21.7 23.4 23.9 24.4 None of these 12 Suppose the birth weights of babies in a particular country is normally distributed with a mean of 3500g and a standard deviation of 510g. If a hospital plans to set up special observation conditions for the heaviest 4% of babies, what is the minimum weight for which this program would be used? 4275 4292.5 4310 4325 4342.5 4360 4375 4392.5 4410 None of these Question 13 - 14 A new scale has been developed for IQ in which the middle 80% is between the scores 168 and 232. Assume the distribution of scores on this new scale is normal. 13) What is the mean? 160 161 162 170 177 180 190 190 200 235 None of these 14) What is the standard deviation? 12 15 17 20 22 25 27 30 35 38 None of these