The following table displays information on the abortion rate- the number of abortions per 1,000 women- for each U.S. state and the District of Columbia in 2000.
a. What are the mean and the standard deviation for the abortion rate for all states?
b. Using the information from (a), how many states fall more than 1 standard deviation above the mean? How does this number compare with the number expected form the theoretical normal curve distribution? Can you suggest anything these states have in common that might cause them to have higher abortion rates?
c. How many states fall more than 1 standard deviation below the mean? Is this number greater or lower than the expected value form the theoretical normal curve? Again, can you suggest any characteristics these states have in common that might cause them to have lower abortion rates?
d. Create a histogram of abortion rates for all 50 states and Washington, D.C. Does the distribution appear to be normal? Use this information to further explain why the number of states falling more than 1 standard deviation below the mean differs from the expected value.

... number, divide by the total number of pairs (7) and you get the standard deviation! ... This will show you how to calculate means and standard deviations. ...

... 68% of observations will lie within +/- 1 standard deviation of the mean, 95% of the observations will lie within +/- 2 standard deviations, and 99.7% will lie ...

...standard deviation of the mean. This can be written as 1. 2. About 95 percent of the area under the normal curve is within two standard deviations of the mean, ...

... a. Determine the mean, median, and the standard deviation. ... 5. The arithmetic mean is the only measure of ... tendency where the sum of the deviations of each value ...

... Mode = 3. Variance & standard deviation. Number of bags. Variance is the average of squares of deviations from mean. Total of squares of deviation = 1,690,610,846 ...

Probabilities, Mean, Variance and Standard Deviation. 1. You are warming up with the dice in the lobby of a casino before making your move to the casino floor. ...

... Probabilities. Common Data Mean 73.63 Standard Deviation 0.683327969. Probability ... 0.5754. The statistical analysis for standard deviations are examined. ...

... Therefore, at least 75% of the observations fall between -2 and 2 standard deviations from the mean. -2 standard deviation from the mean: 57.07-1.05*2=54.97 +2 ...