9. who] We want to estimate the proportion of individuals who will have a severe reaction to a vaccine. We want the 95% confidence interval for this proportion to be no wider than 4%. How many individuals who have received vaccines do we need to include in our sample? 10. Paul and Hymie draw 7 letters from a bag of 100 tiles the start of a Scrabble game. The letters Q. Z and X are desired because they are worth the most points. There is only one tile for each of these letters. If letters are drawn without replacement, what is the probability that Paul draws 2 of the desired letters in the first 7 letters he draws? 11[_....-] City crime records show that 20% of all crimes are violent and 80% are non-violent involving theft, forgery and so on. 90% of violent crimes are reported versus 70% of non-violent crimes. A. What is the overall reporting rate for crimes in the city? B. If a crime in process is reported to the police, what is the probability that the crime is non-violent