I would like to understand how does standard deviation relate to the spread of data

I would like to understand how does standard deviation relate to the spread of data

I don't understand the formula and how to use it to solve this problem

I am struggling with this homework for a stats course. The teacher is very unclear and I cannot afford to fail. Any help would be appreciated it

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...

Group A (n = 12) has a mean score of 7.42. Group B (n = 12) has a mean score of 6.00. Standard deviation for scores across all participants is 1.369. Group A's mean is significantly higher than Group...

The scores of 2500 students on an exam have an approximately normal distribution with mean of 52 points and standard deviation of 11 points. Estimate how many students more than 52 points. If necessary,...

the number of nuts in a can of mixed nuts is found to be normally distributed, with a mean of 500 nuts and standard deviation of 20 nuts. my can of mixed nuts has only 475 nuts. what is the z-score...

What is the area between 214 pounds and the mean of 200 pounds

Suppose that the scores on particular FDMAT 108 unit exam at a University were normally distributed with a mean of 78 and a standard deviation of 10. 1. About what percentage of the scores...

Consider a standardized Intelligence Quotient (IQ) test that results in IQ scores which are normally distributed with a mean of 100 and a standard deviation of 15. Use the 68-95-99.7 Rule to find...

Given the data set below, find the standard deviation and compare it with the estimate of the standard deviation using the range rule of thumb. {20.95, 19.2, 12.55, 26.2, 15.3, 4.6, 30.75} 1...

with 30 participants variance and standard deviation of ss=120 I have to show all my work.

d) Differences in the experimental design b) Equal variance of data points around the two means a) The data points varied more widely around the mean...

Mean breaking strength 500 lb standard deviation 100 lb Mean breaking strength 500 lb standard deviation 10 lb Explian why you think your choice is a better choice? rope a or b?...

A normal distribution has a mean of 142 and a standard deviation of 16. What is the probability that a randomly selected value lies between 142 and 174?

Use the frequency distribution table below showing a sample data set for 10 students on a test with a maximum score of 12 to find the mean score. Score Frequency 1...

Looking for the range of outcomes. I believe they are as follows. 1 SD = -3% to +23% 2 SD = -16% to +46% 3 Sd = -39% to + 59% Is...

A report claims that the returns for the investment portfolios with a single stock have a standard deviation of 0.4848?, while the returns for portfolios with 3131 stocks have a standard deviation...

An investment portfolio has an annualized return of 8.84% with a standard deviation of 14.24% Calculated over a 20 year period. What is the expected return with one, two and three standard deviations...

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