A population has a mean u = 83 and a standard deviation o = 21. Find the mean and standard deviation of a sampling distribution of sample means with sample size n = 243. HE =(Simplify your answer.) of = (Type an integer or decimal rounded to three decimal places as needed.) Time Remaining: 02:52:30 Submit teof 65 This question: 1 point(s) possible Submit t K A variable of two populations has a mean of 32.3 and a standard deviation of 18 for one of the populations and a mean of 32.3 and a standard deviation of 26.7 for the other population. For independent samples of size 6040 and 4417, respectively, find the mean and standard deviation of x1 - X2. The mean of x1 - x2 is . (Type an integer or a decimal.) The standard deviation of x1 - x2 is ]. (Round to four decimal places as needed.) Time Remaining: 02:51:36 NextSpring2 Question 63 of 65 This question: 1 point(s) possible Find the value of za- K a =0.11 The value of Zo,11 is . (Round to two decimal places as needed.) Time Rem\fFind the Z-scores that separate the middle 59% of the distribution from the area in the tails of the standard normal distribution. Click the icon to view a table of areas under the normal curve. The Z-scores are. (Use a comma to separate answers as needed. Round to two decimal places as needed.) Time Remaining: 0