The average commute to work(one way) is 25 minutes according to the 2005 American community survey. If we assume that commuting times are normally distributed and that the standard deviation is 6.1 minutes, find the probabilities. Using graphing calculator.            Question: the selected commuter spends less than 17 minutes commuting one way? I keep getting an error message when using my ti84.

I’ve already posted this one, but I’m posting it again, because I need to be shown what to input into my TI-84 Plus calculator to solve.

Please discuss the concepts of Mean, Median, Mode, and Standard Deviation, including when each should be used, and evaluate the differences of each. How can knowing this information about data help us?

There are two national college-entrance examinations, the scholastic aptitude test (SAT) and the American College Testing program (ACT).  Scores on the SATs are approximately normal with mean 500 and standard deviation 100.  Scores on the ACTs are approximately normal with mean 18 and standard deviation 6. Use the links provided for the Normal  (Links to an external site.)calculator and the Inverse Normal  (Links to an external site.) calculator to help complete the problems, you do not need to do any work out by hand. (instructions on how to use these calculators can be found in the week 5 star on the home page)  a)  What percent of all SAT scores are above 600? b)  Which is the greater accomplishment, scoring 630 on the SAT or 22 on the ACT ? Explain your reasoning for your choice. c)  How high a score in the SAT is needed to place in the top 2.5%.

The problem below asks you to compare 4 different forecasting methodologies to determine which forecasting model results in the most accurate forecasts.  Accuracy is determined by the lowest mean absolute deviation.   Emergency calls to the 911 system of Greenville County for the past 24 weeks are shown below.  Accurate forecasts are needed to determine the number of operators needed to staff the station.    Week # of Calls 1 50 2 35 3 25 4 40 5 45 6 35 7 20 8 30 9 35 10 20 11 15 12 40 13 55 14 35 15 25 16 55 17 55 18 40 19 35 20 60 21 75 22 50 23 40 24 65     1. EXPONENTIAL SMOOTHING Compute the forecasts using α = .2.  Calculate the MAD for weeks 4 through 24 only. Compute the forecasts using α = .6.  Calculate the MAD for weeks 4 through 24 only.   2. SIMPLE LINEAR REGRESSION Use all of the data, weeks 1 - 24, to calculate the…

The NJ Department of Health has reported the average life span of NJ residents is 81 years. If the standard deviation is σ = 4 years, what is the probability of a person living to at least 92 years of age?

I need help solving this statistics problem.

I’m taking probability and statistics class. Please get this correct as I’m using this to study. Thank you so much

z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6 feet 8 inches, or 203 cm. Based on statistics from Data Set 1 “Body Data” in Appendix B, his height converts to the z score of 4.07. How many standard deviations is his height above the mean?

When you have significant results in data analysis, it is customary to report all relevant means and standard deviations.   True or false