What percentage of a normal curve falls above +1 standard deviation?

What percentage of a normal curve falls above +1 standard deviation?

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 150 lb and 201 lb. The new population of pilots has normally distributed weights...

What is the probability that you do not draw a red face card? How many different sequences are there if you handed out all of the hearts in a deck of cards? What is the probability of drawing...

Given the following information calculate the appropriate test statistics (Zobs or tobs) for testing the equality of the population mean to the given value μ0, and determine whether the test statistic...

A department store wants to sell eight purses that cost the store $40 each and 32 purses that cost the store $10 each. If all purses are wrapped up in forty identical boxes and if each customer picks...

I have the solution, I just can't get it. The answer says 3/5, wouldn't be it 1/3 as there are either 2 or 3 or 4 white balls. I know they are not mutually exclusive but in the solution they...

If female blood pressure is normally distributed with a mean of 114 and standard deviation of 19.8, find p12 and p77

The standard error of the sample mean is calculated to $1,475.73. The president wants to be able to estimate mean cost to within $1,500 of the true population mean with a probability of 80%. How many...

A normal distribution has a mean of 20 and a standard deviation of 10. Two scores are sampled randomly from the distribution and the second score is subtracted from the first. What is the probability...

A machine has four components, A, B, C, and D, set up in such a manner that all four parts must work for the machine to work properly. Assume the probability of one part working does not depend on...

Set no. :- 1, 2 , 3 no.of data:- 9 ,12 , 15 mean value :- 8 , 7 , 9 standard deviation:- 1.6 , 1.2 , 1.4 Considering all the data sets together , the overall...

Suzie Mean number of candy bars sold by team members 20 Standard deviation 3 Candy bars sold by respective sister 35 Becca Mean number of candy bars sold by team...

7. A population has a mean of 85 and SD of 9. If many samples of size n = 100 are randomly drawn from the population, approximately what proportion of the sample means fall between 84 and 86? Explain...

A survey of grade point averages over the last 20 years is taken at Academy. It is found that the mean is 2.52, the median is 2.65, and the standard deviation is 0.55. Assuming a normal distribution,...

http://imgur.com/a/EfXOD These are model equations that I need to interpret the parameters for. What are they? Where can I find more information about them?

using central limit therom. The mean weight of an adult is 76 kilograms with a variance of 100. If 142 adults are randomly selected, what is the probability that the sample mean would be greater than...

The below data set is the test scores out of 100 for a maths test for 50 students. 56 29 78 67 68 69 80 89 92 71 58 66 56 88 81 70 73 63 74 38 67 64 62 55 56 75 90 92 47 44 59 64 89 62 51...

A programmer plans to develop a new software system. In planning for the operating system that he will? use, he needs to estimate the percentage of computers that use a new operating system. How many...

In a set of 95 ACT? scores, where the mean is 25 and the standard deviation is 6.08?, (a) how many scores are expected to be lower than 18.92 (one standard deviation...

I calculated a percentage and I need to find out the error of that percentage. Example: Percentage difference is 10%. How do I find out the plus or minus error? So get something like this "0...

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