assuming that adults have IQ scores that are normally distributed with a mean of 102.4 and a standard deviation 21.7. Find the first quartile Q1. Which is the IQ score separating the bottom 25% and top 75%.What is the first quartile?

This problem is fill in the blank. Just choose the correct answers. Thank you for your help   A psychologist is studying the self-image of smokers, as measured by the self-image (SI) score from a personality inventory. She would like to examine the mean SI score,  μ, for the population of all smokers. Previously published studies have indicated that the mean SI score for the population of all smokers is 85 and that the standard deviation is 10, but the psychologist believes that the value for the mean has increased. She plans to perform a statistical test. She takes a random sample of SI scores for smokers and computes the sample mean to be 95.   Based on this information, answer the questions below.   1. What are the null hypothesis (H0) and the alternative hypothesis (H1) that should be used for the test? H0: (choose one) less than, less than or equal to, greater than, greater than or equal to, equal to, or not equal to.     (choose one)     85, 95, or 10. H1: (Choose one) less than,…

I need help with this one please thank you!

Help please

The mean is 146 and the standard deviation is 35. A score of 41 is how many z-scores below the mean?

Please help me understand the problem. Is the given standard deviations 6, and 7? I know I need to use the unit normal table, and shade the curve. But how? Thanks.

i need the second part of the question

I need help solving this statistics problem.

I'd like the first question answer, the one that fills in the boxes. I can do the rest

Answer the question in the second photo with the data provided in the first photo