Question 1 (Mandatory) (3 points) For the standard normal distribution, what is value for the 70th percentile? O0.91 O0.52 0.56 0.41 Question 2 (Mandatory] (4 points) The IQs of individuals admitted to a state school for the mentally challenged are approximately normally distributed with a mean of 50 and a standard deviation of 10. What is the probability a randomly selected individual from the school will have IQ higher than 60? 0.1329 0.8413 0.2000 0.1587 0.1883 Question 3 [Mandatory) (5 points) An instructor gives a 100-point examination in which the grades are normally distributed. The mean is 70 and the standard deviation is 10. If the instructor decides to give an A+ to students whose scores rank in the top 2%, what is the cutoff score she must use? 90.50 93.30 O1.68 98.00 1.645 Question 4 (Mandatory) (2 points) The Central Limit Theorem states that: ) if the sample size n is large, then the sampling distribution of the sample mean can be approximated closely by a normal distribution. if the sample size n is large, then the variance of the sample must be small O if the sample size n is large, and if the population is normal, then the varianos of the sample mean must be small. if the sample size n is large then the distribution of the sample can be approximated closely by a normal curve