A sample of size 50 will be drawn from a population with mean 12 and standard deviation B.) Find the 45th percentile of x. Round the answer to at least two decimal places.

Scores for men on the verbal portion of the​ SAT-I test are normally distributed with a mean of 545   and a standard deviation of 112 . If 16 men are randomly​ selected, find the probability that their mean score is at least 590. a. Define the parameter     A. x overbar equals The mean score of 16 randomly selected men   B. x overbar equals The score of a randomly selected man   b. State the mean of x overbar ​: nothing   c. State the standard deviation of x overbar ​: nothing   ​(use 2 decimal​ places)   d. Find the​ z-score: nothing   ​(use 2 decimal​ places)   e. Find the​ probability: nothing   ​(use 4 decimal​ places)

Assume that adults have IQ scores that are normally distributed with a mean of u= 100 and a standard deviation g= 15. Find the probability that a randomly selected adult has an IQ less than 118. Click to view page 1 of the table. Click to view page 2 of the table. The probability that a randomly selected adult has an IQ less than 118 is (Type an integer or decimal rounded to four decimal places as needed.)

. State the interval estimate that contains more possible values of the population mean (precision) for a 90% CI or a 95% CI for the same data.

Assume that adults have IQ scores that are normally distributed with a mean of 104.5 and a standard deviation 24.7. Find the first quartile Q,. which is the IQ score separating the bottom 25% from the top 75%. (Hint Draw a graph.) The first quartile is (Type an integer or decimal rounded to one decimal place as needed.)

The scores on a mathematics exam have a mean of 70 and a standard deviation of 6. Find the x-value that corresponds to the z-score 5.19. O 64.8 O 121.9 O 18.1 O 101.1

Assume that adults have IQ scores that are normally distributed with a mean of 97.2 and a standard deviation 21.8. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is. (Type an integer or decimal rounded to one decimal place as needed.)

Help me find which A,B,C, or D is the correct answer to the last part please. The brain volumes ​(cm3​) of 50 brains vary from a low of 904 cm3 to a high of 1490 cm3. Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 191.4 cm3​, assuming the estimate is accurate if it is within 15 cm3. The estimated standard deviation is 146.5 cm3.     A. The approximation is not accurate because the error of the range rule of​ thumb's approximation is greater than 15 cm3.   B. The approximation is not accurate because the error of the range rule of​ thumb's approximation is less than 15 cm3.   C. The approximation is accurate because the error of the range rule of​ thumb's approximation is greater than 15 cm3.   D. The approximation is accurate because the error of the range rule of​ thumb's approximation is less than 15 cm3.